2000 Durango.

The engine revs up quite a bit when I put it in park and the RPM's fluctuate +/- 1000 RPM's while driving on steady roads, the transmission light coming on and getting codes for Injector Circuit Malfunction (flashes codes P0202, P0203, P0205, P0207). This problem has only happened maybe 3 or 4 times in the past year but isdoing itmore now. The revving happens almost all of the time, unless I rev it up before I put it in park, if I do that then it revs down and stays steady around 750 RPM's. If I don't rev it then it fluctuates and even when I start up it "remembers" that it was running crappy and starts up revving up and down as well. A/C on or off doesn't make a difference either.

 

Have you addressed the Injector Circuit Malfunction problem and see if the problem still exist? If so, try replacing the TPS (Throttle Position sensor) located on the drivers side of the throttle body.

 

The revving happens everyday but the engine light only comes on after a long drive, 50 to 100 highway miles, thats whenI pluged in and had many injector circuit codes. Please help me to understand how to address the Injector Circuit Malfunction.I did replace the TPS last year, no change though.