I have a 2000 dodge durango 4.7 V8

I have been experiencing issues when I idol for a bit of time in park (p) my RPM goes between the 0 and lower and gradually drops down to "almost" shutting off then shoots up (revs) and stays on the 0, now my mechanic said it was my O2 sensor so I fixed that needless to say $200 bucks later that wasn't the issue. Then he fixed another part idol sensor pressure something or other. Again $170.00 bucks later that wasn't the issue either.

I am begging anybody to please steer me in the right direction before I dump more needless money in my truck!

 

I would say the IAC and clean the Throttle Body. The other thing it could be is a bad TPS. You can check this by monitoring the middle wire with a good multimeter to ground and watch for fluctuation.

 

That's what it was called was an IAC and yes that's what was changed already. Sorry I am a female and have no idea about vehicles just gas and go lol.

 

change the IAC first, if that does'nt solve your problems go with the TPS sensor also. The issue is usually located around the throttle body.

 

Yup IAC was done first, then the O2 sensor so I guess my next bet is trying the TPS which I will get done tomorrow. And keep my fingers crossed

 

sometimes you dont need to replace the TPS sensor, just use carb cleaner to clean it.. however it only works now and then. Good luck!

 

you cant use carb cleaner to clean the tps, its not even inside of the throttle body, it is a rotary sensor mounted on the butterfly valve shaft, outside of the throttle body. as the throttle cable (gas pedal) is tightened, the butterfly valve opens, which turns the TPS, which tells the computer how far open the valve actually is. nothing to clean, if its acting up it needs to be replaced.

 

I had the same exact problem with my 2000 4.7L V8 Durango. It was the TPS. If I remember correctly, the part cost approximately $55 and took less than 5 minutes to install.

 

Well just had the TPS changed and still the same problem. My mechanic seems to think it is my computer board in my truck. When he changed out the O2 sensor he showed what had happened and the sensor was burnt to hell and so was the wiring. He seems to think it traveled so far up that it ruined my computer board.

Has anyone heard of this happening before?

 

yes, bad sensors CAN cause damage to the PCM, but it is VERY UNCOMMON so i would not jump to that conclusion