89GT missing at low rpm
 

Hi
I just got an 89 GT and it will hesitate and buck back and forth at lower rpms below 2grand. THe car also revs up and down at idle speed untill it really gets hot then it settles down. What might this be
Thanks

Oh boy, could be a bunch of different things, First thing to do is check codes. Also make sure of no vacuum leaks (You can spray carb cleaner around intake and vacuum hose and if rpm raises you found one) Once youve found out codes (Or even if none) post back and might be able to give a little more definate answer.
Bill

I just wanted to add that the car runs better when it is all warmed up.

I'm going to say check coolant sensor and air temp sensor, could also be MAF. You can get code checker at Auto Zone, DAP, even Sears for cheap. Let us know what codes you have.