Trottle

I just bought a 1991 G20 and it is not idling properly. I put a fuel injector cleaner in and that didn't seem to work. What els can i check for or adjust? Thanks

Try adjusting the timing. You might want to check your plugs also.

He's right...plugs/ wires, maybe distributor...

Otherwise, timing sounds like the problem.

As well as O2 sensor...
Good luck

If you just bought it used. Look inside oil cap and make sure you car is not all sludged up on the inside. I am learning this lesson the hard way now ... if it is take it back !!!

I had idle problems that turned to hesitation problems. I found out my engine's cam and rockers are all groung down..... Now I need new engine because the insdie of my enigne looks like the grinch's heart or irs agent....