Hey guys I'm new to the forum and have a quick question.

I have a 91 TPI Z28 Auto. with 120,000miles headers and full exhaust and egr is eliminated.

When I start the car cold it idles fine but as soon as it gets to operating temp it starts to bog and if I'm in gear it causes the car to hop forwards but if i put it in neutral the idle gets slightly better.

IAC is fine and TB was cleaned as well. Tune was done and only premium fuel is being used.

Any input we be great thanks for the help in advance.

 

When was the last tune up?

 

couple months ago. Full tune up

 

Ohm check your injectors

 

Took it to GM and they checked the injectors. They replaced 2 or 3 i forget now but the problem was still there. I'm also not getting any check engine light codes at all.

 

can you even get a code 12? that is normal. If your injectors are fine then i would look toward a vacum leak or a bad ecm.Does your car pass the key test? Turn key on and watch for a quick blink , then SES light should turn solid? that should let you know the prom is still good.

 

Verify your timing is right too.