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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I have a 1993 gmc Sierra extra cab had slight miss

depend your maintenance Schedule but it look like a tune up
like spark plug,spark plug wire. cap ,rotor. air filter ,fuel filter.clean trottle body.
hope it helps

Oct 19, 2014 | 1993 GMC Sierra

2 Answers

1997 GMC Sierra 5.7 has bad miss on left bank (2 4 6 8).

Don't know if you did the work or paid someone

If you paid someone ,then they failed to do what was
necessary to properly resolve ALL issues

Entire right bank appears to have a leaking intake gasket,
that is my guess,only a guess

Dec 12, 2012 | 1997 GMC Sierra

1 Answer

I have 1998 GMC k1500, I took it in for Smog test in California,

slite posibility of head gasket leaking a little or could be a worn piston ring you have changed every thing else

Sep 02, 2012 | 1998 GMC Sierra

2 Answers

I have a 1994 gmc 1500 sierra 5.7 liter v8 truck. Ive change the egr valve spark plugs wires distributor cap. It runs good on the highway no studdering in the engine at all. But at times it may miss a...

Hello: You might check the dist cap and rotor for white powder corrosion. Check the spark plug wires. Make sure wires are not against metal. If you load up the truck does it miss?

Jan 09, 2011 | 1994 GMC Sierra

1 Answer

97 gmc k1500 5.7 was hard to start and I gaped the plugs that I already had to the specified gap and now it starts really hard. What do I need to do.

the coil might need replacing ,i have an old caddy it was hard to start when it was hot ,my coil was on top of my distributor cap, just google the location of yours if your not sure

Sep 26, 2010 | 1997 GMC Sierra

1 Answer

I have had intermitent missing when it is damp

Cap and rotor, spark plugs and wires.

Apr 14, 2010 | 1996 GMC Sierra

2 Answers

93 gmc k2500 4x4 runs like its missing when warmed up. cat.converter? pulled someone out of mud,hard. over tacked engine

a bad cat will cause it not to rum faster than 45mph. usually miss at warm after over taxing is bad camshaft. you probably knock the lobe down. you need to do a compression test on all cylyinders. they need to be reading close to each other. also just make sure plugs and wires are good. cap and rotor also

Dec 27, 2009 | 1993 GMC Sierra K2500

2 Answers

Misfires 96 gmc sierra 5.0

if the check engine light starts flashing its probably setting a code may have an injector problem

Aug 05, 2009 | 1996 GMC Sierra

1 Answer


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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