Rough IDLE help?

[Silva22]

I have a 92 gmc typhoon that has a very rough idle at start up. when i turn it on the idle is very rough and sometimes even turns off as soon as i turn it on. it stays like this for a while until it warms up. but once i put it on drive once again it starts acting up. i dont know what the problem is, i changed plugs, sparks, rotor gave it a tune up and everything and still cant figure it out. Also while driving and i flore it boost goes all the way up but gains speed slowley. Dont know what that could be either. The TY is stock and any advice would help thanks!

 

[Static]

Re: Rough IDLE help?

Check for vacuum leaks?

 

[Osmosis]

Re: Rough IDLE help?

Vac leak is what I was thinking.

Spark

Fuel...check fuel pressure at idle and under a load

Air..Vac leak. Get a vacuum gauge and check at ilde. :tup:

 

[berzerker]

Re: Rough IDLE help?

plugged cat

fuel pump dying

crossed plug wires

incorrect parts used when tune up was done

just my thoughts

 

[Jimmy]

Re: Rough IDLE help?

Big ass vac port on the back of the throttle body needs to be blocked off or it will never idle.