Chev is known for injector issues. You may have to remove the intake plenum and change one or 2 of the injectors. You can find them reasonably cheap online. You can test individual injectors with a small square 9 volt battery - never use a 12 volt car battery on electronic components as it's too much amperage.
SOURCE: need how to find TDC on 4.3 v-6
Remove # 1 plug and stick your finger in the hole, roll the engine over by hand, when you start to feel pressure in the cylinder you are near TDC, just check the crank pulley marks to zero it to TDC mark on pulley.
SOURCE: check engine light 2004 GMC Yukon
When my check engine light went on, it was a oxygen sensor
SOURCE: 1995 Buick Park AV intake manifold gasket starting to leak
THIS IS VERY COMMEN IN FACT JUST ABOUT EVERY SINGLE 3.1AND 3.4 AND 3.8 EVER MADE BY CHEVY LEAKS AT THE LOWER INTAKE ALL OF THEM AND USEALLY STARTS AT ABOUT 50000 MILES THE PARTS COST ABOUT 300.00 AT THE DEALER FOR NEW GASKETS AND COOLENT AND SEALENT ALL THE PARTS YOU WILL NEED THE PROBLEM IS ITS ABOUT A SIX HOUR JOB SO THE LABOR KILLS YA BUT IT IS ALOT OF WORK BUT THE GOOD PART IS THERE IS NO NEED TO REMOVE THE PUSH RODS ON A 3.8 LIKE YOU DO ON A 3.4 I CAN GIVE YOU THE STEPS IF YOU LIKE BUT THIS JOB IS BEST TO SEND TO A MECHANIC AS IT HAS A LOT OF LITTLE THINGS THAT MUST BE DONE OR YOU CAN MAKE A BIGGER MESS THEN YOU GOT ALREADY... HOPE THIS WAS HELP FULL LET ME NO IF YOU NEED MORE INFO
SOURCE: How to install intake manifold gaskets and their location.
go to autozone.com and register free then select make year ect.
select repair info (you have to register 4 this)
step by step and photos!!!!
SOURCE: I have 96 gmc 350 vortec. missing really bad. Ive
ou need to check compression on all the cly. do you know which cly is dead?
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check the mass air flow sensor and the hoses leading to it make sure something is not blocking air flow, what is the code you are getting
Could be a bad coil. In rare cases the engine computer could be faulty
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