I get a rough idle while the car is in gear and in idle (not as bad when not in gear). I think the idle is too low personally but there is no screw to turn out to raise it (old school).
The car has 125K miles.
I replaced the spark plugs at 110. they were not AcDelco.
It has been run on regular for a long time (I just got it back from the wife).
What could be the cause and solutions. Cheapest to most expensive. I have heard EGR,Throttle body, MAF, and Idle control unit (IAC).
Also there are no codes being thrown according to the ODBII reader I have.