worn out spark plugs.
crankshaft sensor going.
I have python tips and it idles off beat and sometimes dies.
It could be a dirty air filter or a dirty throttle body.
Manual or automatic transmission?
idle control valve faulty or needs cleaning
It sounds like your speed sensor is going bad. It is located below the air tube that connects the air cleaner to the intake manifold, on the passenger side, on the transmission.
sounds like you have a leaky intake manifold
Replace the plug wires
If your truck has a "throttle position sensor" then that's where I'd start. The fact that it's an intermittent problem is a good clue that it's a sensor going bad. Also, it won't necessarily trip your "check engine" light. Mine didn't.
idles at 3000 will not go down 1993 grand prix gtp
My 1990 idles at about 850 and with the ac on 1100
Cinnamon Idles was born on October 26, 1975, in Chicago, Illinois, USA.