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I have a 95 chevy 1500 4x4 5.7L 145,000mils. It's been running good/bad for a few months. It will start right up and idle ok in park but as soon as I put it into drive it stalls out. If I put in drive and try to keep it running the rpms will just go up and down hard then stall out. I have put a new O2sensor, cap, ignition mod (under the cap), the last thing I just did was a new coil and still nothing??
 

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I would perform a sweep test on the throttle postition sensor, and also check the fuel pump pressure. for a 1995 you need to have at least 12PSI.
There are threads here on the site on how to preform both of these tasks and how to handle which problems. This is at least a place to start let us know how it turns out and we can go from there if everything is where it needs to be.
 

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I have the same problem with my truck and at constant speeds it will lose power and die... replaced fuel pump/filter,all plugs and wires, cap and rotor,coil,map sensor, tested iac and throttle position sensors and put a new fuel pressure regulator on it and it still does it! any sugestions? thanks, Nick
 

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on my 90 K1500, after sitting for a year i had a similiar problem when i got it running. What fixed it for me was replacing my 02 sensor and stabil gas stabilizer. but I also had other issues due to the o2 sensor.
 

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I have a 95 chevy 1500 4x4 5.7L 145,000mils. It's been running good/bad for a few months. It will start right up and idle ok in park but as soon as I put it into drive it stalls out. If I put in drive and try to keep it running the rpms will just go up and down hard then stall out. I have put a new O2sensor, cap, ignition mod (under the cap), the last thing I just did was a new coil and still nothing??
Ok I just spent the better part of 6 months chasing this problem myself and it's none of the above. To cut threw the case; just swap out your distributor but good luck finding a Distributor wrench that works really well. I in the end purchased a 9/16 Pontiac Distributor wrench then heated up the handle with a torch & bending it clock-wise about 90 degrees, it fits perfectly. After it only took me 30 minutes to sway out my old distributor and replace it. If you haven’t already figured this out, your Distributor is worn out its time to replace it. Trust me.
Good Luck!
 

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Discussion Starter #7
I put a new distributor in it and it still ran like ****. So I sold the truck to my friend. He put a new fuel pump in and found out the ground wire was off the truck. Coming from the fuel pump. Started it up and it ran ok?? Lol
 

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That stinks that you sold it just to find out that it was a wire. I watched my neighbor sell a really nice restored 1985 chevy pickup to a guy really cheap. My neighbor could not get it to run right. The guy paid him. Popped the hood, adjusted the carb for about 1 minute. The truck started running great. He took it home and sold it for double what he just paid my neighbor.
 

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I would take a long, hard look at the ground connections, especially those on and near the thermostat housing. Make sure they are clean and tight, and if there is one on the thermostat housing bolt, move it to the intake manifold bolts at the head.
Good Luck and God Bless.
 

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I would take a long, hard look at the ground connections, especially those on and near the thermostat housing. Make sure they are clean and tight, and if there is one on the thermostat housing bolt, move it to the intake manifold bolts at the head.
Good Luck and God Bless.
Thanks for your comments. I just wanted to say hi and see if you wanted to hear about my OBE in 1985. I had a motorcycle wreck 50' head over heels down a curb, no helmet. Doctors did not think I would make it but Mercy said not him and He took me and showed me some neat stuff. Oh yea I walked out of hospital in 45 days and doctor wrote my recovery as miraculous. I did not want to come back. Hope to hear from you.
 

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I have a 95 chevy 1500 4x4 5.7L 145,000mils. It's been running good/bad for a few months. It will start right up and idle ok in park but as soon as I put it into drive it stalls out. If I put in drive and try to keep it running the rpms will just go up and down hard then stall out. I have put a new O2sensor, cap, ignition mod (under the cap), the last thing I just did was a new coil and still nothing??
First figure out if it is flooding or starving. My truck did exactly what yours did. Mine was flooding. I tried replacing alot of throttle and ignition parts. Then a mechanic friend did some checking and told me to pull the injector plugs, and try running it. If fuel comes out the injector is stuck open. If they are fine then try the engine coolant sensor and exhaust O2 sensor. If the coolant sensor is bad it tells the ecm that the truck is -20 so it pumps more fuel. If the O2 sensor is out or bad the ecm thinks it is running lean and pumps more fuel.
 

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Kris, good info for the next guy, thank you.
Not finding fault bud; but the OP hasn't been around for 6 years.
(Check the post date, bottom left corner; and click on the avatar to see the last "on site" date
 
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