need help on rough idle on 93 typhoon

[gmc syclone]

is there anybody in the denver co area that can help me diagnose it

 

[berzerker]

Re: need help on rough idle on 93 typhoon

How long has it been since it's last full tune up ? if longer then a year ,,time to do it again ! These trucks aren't Honda civics . They need full attention all the time . Can be done for $ 60.00 if you know what to buy .

 

[nello]

Re: need help on rough idle on 93 typhoon

First, I'd check plugs/wires/ignition as suggested. If it's really bad, I'd start looking at the lower intake manifold, and upper for a leaky gasket. Next, I'd start looking at the injectors...perhaps one is dripping instead of spraying?? You'd probably see a crack or missing bit of plastic on the injector after pulling it. GL bro.

 

[gmc syclone]

Re: need help on rough idle on 93 typhoon

I got the truck in September last year guy said he brealy had did tune up and oil change the truck idles good for a little bit then it tweaks out for like 2 seconds like it wants to turn off then idles normal and it keeps repeating like that over and over again

 

[Sy1566]

Re: need help on rough idle on 93 typhoon

Inspect the check valves and vacuum lines and make sure they're not leaking or rotting. Replace as needed.

 

[T-Bone]

Re: need help on rough idle on 93 typhoon

Perhaps a faulty IAC valve on the back underside of throttle body :dunno:

 

[Damian]

Re: need help on rough idle on 93 typhoon

Mine does this too but it does shut off every once and awhile. I can't figure it out for the life of me.