Question about 1994 GMC Sierra
Runs extremly rough at idle .runs great at speed or under load 1994 5.7l tbi Has new cam ,lifters ,distr, plugs and wires
Change fuel regulator and upper plenum gasket I had same problem with my 96 Gmc 5.7lt threw a bunch of parts at it costing hundreds I finely broke down pulled top plenum about a 3 hr job cost 60 bucks runs like a raped ape now hope this helps
Posted on Apr 21, 2012
Have you checked the pcv valve. a vacuume leak will make your car idel rough too listen arround the throttle body and intake hose for a hiss use a piece of hose @ 2 feet long 1 end in ear other end prod arround to listen for a hissing sound if you hear one plug it up if idle gets better that hose or hole need to be connected to what ever it came off of.
Posted on Jun 26, 2009
Did you get the timing right?
Listen for air leaks around throttle body base.
Posted on Jun 24, 2009
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Posted on Jan 02, 2017
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