rough running

**heaviechevie** · 10-08-2008, 07:57 PM

I have an 86 K10 with a 350 in it. I put a holley carb on it an the thing ran fine for about 2 months. This morning the engine ran rough. It was ok when idling or when on gas but when you stop at a light or sign it wants to stall. I looked at it when I got home and heard a vacuum leak. Behind the carb there is a fitting that goes into the intake right infront of the dist. What vacuum line goes on there? It has suction when I put my fingure over it.

**unplugged** · 10-08-2008, 10:59 PM

Til someone with a similar model posts the answer to your question. How about putting a cap on the vacuum port? Does it run OK then?

**heaviechevie** · 10-09-2008, 12:06 PM

I did cap it off, the idle changes but it still seems to have the same problem when in drive or reverse of wanting to stall. I did reset the the fuel mixture and bumped the idle up but still no change. This all just came on all of a sudden engine was running beautiful till yesterday morning.

I entered the above earlier today and I just came in from playing with it. Wifes not to happy that I stayed home but oh well. I enjoy older vehicles, don't have the computer to mess with.

I'm not to fond of holley carbs so this is only the second one that I've messed with. I usually go with edelbrock. I unplugged the fitting that is mounted on the intake (stock intake) and it seemed to let the engine rev higher, but it doesn't matter what I do unplugg or plug that fitting the engine still seems to have a miss, also when let idling everything works, charging shows around 14 which with this ever since I got it seems to be the norm. When put in gear the volts drop also with the engine idle. But either way there still seems to be that miss. Like I said before it started yesterday morning, I had to keep foot on the brake and give it gas so it wouldn't stahl when stoped and that was the first time I noticed the sucking sound behind the carb. I intalled new plugs and wires about 5 months ago, just put a new coil on this morning, tried adjusting the dist. also. I thought maybe I knocked a plug wire off when I put new valve covers and gaskets on, that was done sunday.

**heaviechevie** · 10-09-2008, 07:11 PM

Does anyone know what fitting on the intake between the carb and dist that I am talking about. It's a stock intake that had a quadrajunk on it originally. I did find a loose spark plug, tightening it didn't change a thing. Changed the fuel filter and got new sprk plug wires that are getting put on tomarrow after work.

**heaviechevie** · 10-10-2008, 09:20 PM

How about this ..... can anyone tell me if my stupid 700r4 trans needs a vacuum line hooked up to it? This is only the second 700r4 that I've delt with that I can think of. The first one blew up and I went to the reliable th350. But I have found information saying that it does and that it doesn't. The fitting that I was talk'n about in my other posts is usually ran down to the trans but I can't find a hose laying around or can I find where it would hook up on the trans, which I'm probably just overlooking but any ideas?

**tbplus10** · 10-11-2008, 09:13 AM

The 700r4 had a few changes over the years, some of the early models used a vacuum kick down, some models used an internal mechanical kick down, and some later models were semi-computer controlled. Type of mechanism depended on yr model trans and application it came from.

**heaviechevie** · 10-12-2008, 05:52 PM

Well when you use comon sense you will prevail ......... bad cap on ditributer equals fouled plugs ..... replace cap and plugs but still have bad running engine, I would open the throttle and the thing still wanted to stahl ..... so I thought about it and went and bought a 37-119 kit. Holley rebuild kit. I rebuilt carb and presto ...... truck runs like it has a brand new engine in it. So all that cost me one day of work, 14 hours of mess'n with it and another $120 in new parts and accessories that I decided to put on since I was taking things apart. Actually only cost me around $70 for the parts to get it on the road again.

**bferland** · 10-13-2008, 09:03 PM

All you need to do is cap it off. Holley's have a few different vacc lines on them. They are all suction. Look on your distributor dep on what kind.. There may be a tiny connection maybe an 1/8 inch that can be connected with just a hose. Otherwise, if you can find no exit on the dist. try and cap it off.