98 K1500 5.7 runs perfect but starts very wierd..Need help!! Long time no post! :)

Discussion in 'GM Powertrain' started by 98 chevy, Jun 29, 2011.

  1. 98 chevy

    98 chevy Rockstar

    On my 98 K1500 5.7 automatic this starting problem has progressively gotten worse. Usually when the truck is cold I will get in it and start to crank it up and it sounds like it's going to start so i let off the key but the RPMs will kind stay real low and the truck will hesitate then finally crank up and idle. (idles a LITTLE rough). but I drove about 15 miles yesterday at about 70mph the truck ran fine and I stopped and parked the truck for maybe 10 minutes and when I got back in it and tried to start it, the truck cranked and cranked for like 3 full seconds then it finally started (barely). I don't know what this could be. I replaced the cap, rotor, plugs, wires not long ago so it's getting spark. The starter is fine I can hear it spinning fast. It should be getting air so my guess would be a fuel problem but the pump was replaced about a yr ago and it runs fine once it's running????

    Any help is appreciated and sorry for the long post.
  2. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    Sounds like your fuel pressure regulator is leaking. Pretty common problem on these trucks. $50 part, couple hours.

    Next time you start it, try stepping on the gas some. That will give it more air to offset the excess fuel in the manifold.
  3. Crispyt

    Crispyt Rockstar 100 Posts

    Could be what cor said, also it could be an idle air control valve or vacume leak as well. Do you have a check engine light on?
  4. 98 chevy

    98 chevy Rockstar

    hmmm...wierd thing is that today when I started up the truck to go wash it, the truck acted totally normal. I drove it a few miles to get her washed up and when I started it back up there was no hesitation at all. No check engine light and if it acts up again i'll give it some gas.

    Thanks for the input!

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