Have a strange situation ...
RPM when starting cold is 1200-1400. RPM when warmed up is 800-900
After driving for 10-20 mts and at stops when shifted to N or P the RPM is 1200. When in N or P if I pump and release the gas it goes back to 800-900.
Also when stopping at a signal light the RPM seems to fluctuate from
1400 to 1200 and the car seems to jerk a bit when that happens.Recent work done... Replaced the radiator ...the old one was leaking and engine was heating up.
The car has 137000 miles on it.
Any ideas??
Thanks