This is very interment. Starts good and runs good to begin and often after engine warms then rough idle, this is not evident at normal driving speeds. The rough idle is not evident every time.
SOURCE: i have a 1994 gmc safari.It seems to have a smooth idle at times
Im not sure if you got it fixed yet! It could possibly be idle air control valve. But here some more suggestions! I had a 94 Safari van 4.3 liter I was working on for about three days and I finally figured out what was wrong with it. It would run fine for a couple minutes and as soon as I hit the gas and let off it would surge, but anyways I ended up changing the distributer, after the fuel pump and filter, mass air flow sensor, egr valve, idle air control valve, map sensor, and ignition module. So that might sove the problem if you were on the same track with it as I was. Hope this helps ya!
SOURCE: 2005 GAm CAnyon Engine idle rough
there is recall because of this problem. the same thing ws going on with mine. contact your gmc dealership. it is a valve problem in the head.the recalll is not published but if take it to the dealer he can check to see if this the problem. this was a cyl. head problem.
SOURCE: 1994 GMC Jimmy hard to start and runs rough when first started
did you do a fuel pressure test? if you havent do it its cheep an at least you can elimanate that. if thats not an issue, then there is only two other things crank sensor, and if there is one cam sensor.
SOURCE: Rough idle only when engine is cold
where is the egr valve located? i haven't seen one on mine...??
SOURCE: 1994 GMC Jimmy engine runs rough when cold; smooths out when warm
you need to have the codes checked to know what direction to start repairs,Autozone does this for free
http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html
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Car
overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
------While stop engine idles
like cylinder missing?
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------This will help.Thanks.
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