when the car is ideling (warm or cold) it idels like at 600-1000 for a couple seconds then the tach goes up a couple hundred RPM then back down,then back up and so on.very strange, never heard this before from my car.it sounds like i gas it a little and let go and so on.what could cause this????vaccum,throttle linkage,throttle body blades???i have no idea.other than that car runs great.all wires and plugs are good and new acccel ignition.

 

could be alot of things, bad gas for one, change the fuel filter, clean the inside of the tb, use injection cleaner, ect ect ect, do the simple things first