Question about 1991 GMC C1500

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Missing i replaced wires,cap,plugs and rotor button gaped plugs at .035 as specified and stii has a miss to it 91 k1500 ec 4x4 5.7 my 1990 gmc sierra 2500 does the same changed plugs coil distributor o2 sensor plug wires rotor ecm, tbi egr still cant figure it out

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Have you tried a good fuel injection cleaner?Not just any cheap injection cleaner,look for a product called lucas,it does the trick,cleaning fuel lines and e g r components ,and injectors,and combustion chambers.It will clean the valves also,so try this before any other parts are installed.If this does not help,have a cylinder balance test done,and compression test,on each cylinder.

Posted on Nov 13, 2009


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1 Answer

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Aug 05, 2009 | 1996 GMC Sierra

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It sounds like you may have an intake leaking. You've replaced the major components so now you need to look for a possible vacuum leaking. The intake gaskets is the easiest part to check. Get a can of brake clean. While the engine is running, spray the brake clean on the top center of the engine. The engine may idle up or idle down or may smooth out. Try this and see what you come up with. If this does not solve you problem, let me know and I will help you figure it out.

Jan 05, 2009 | 1991 GMC C1500

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