I have a '03 4.7 Durango, for the last 2 years ive been dealing with my engine revving when im in park, rpm's shoot up when im driving down the rode and stalling every now and then when i come to quick stop. Ive had it in to the shop numerous times and no one can seem to find the problem, after reading the web searching for my own answer I decided to try a new throttle position sensor today...no luck. Does anyone have any ideas that i should try, this is getting really old. Also, it doesnt do this everyday but almost, so its not consistent. Thanks for any help!

P.S. Also if anyone knows anything about sunroofs, my sunroof opened today and will not shut, dont know if its a bad switch or motor...i hear nothing when i try and open or shut. No motor noise

 

what have you done to the car recently?
or what has been done to try and correct the problem?

you double check all sensors and vacuum lines?

tune-up? like replacing the cap wires plugs cleaned the TB?

also check all fuses

check throttle cable?

for the sunroof i would check fuses

 

Close but no cigar. No distributor on the 4.7 so no cap or wires.

Did you reset the PCM after you replaced the TPS? This is a must so the computer can re-learn the settings for the new TPS output.

Also yes check return spring for the throttle cable and make sure it's working as it should.

I recommend cleaning out the IAC and port because it could be letting too much air in and causing it to idle high. Also check all vacuum lines for leaks. Focus first on the EVAP vacuum line that goes from front of TB to EVAP port on driver side firewall.

Also check the PCV valve line as if its original it's likely to have cracks in it.

 

There aren't any cap or wires on the 4.7.
What type of spark plugs are you using? ... platinums are known for wreaking havoc on these engines.
How about the IAC (idle air control)? It can cause rough engine idle.

 

Didn't mean to echo you Widow. LOL. Looks like you beat me to the post button.

 

No problem brother! +1 on the platinums screwing with the engine.

 

Someone help me with the return spring inspection please. I have similiar symptoms but when I goose the throttle the idle surging seems to go away. I have r/r the TPS/IACV/SEAFOAM/cleaned throttle body, checked for vacuum leaks...tried to eliminate all the usual suspects.

 

Magic, have you replaced the MAP sensor? They're about $75. I don't know to test one.
Also, I know you're on here all the time but I have to throw it out there... did you reset the PCM after replacing each sensor?

 

I have 03 4.7 I done even recall there being A MAP sensor. If someone does have one I sure would appreciate a photo.

No offense or insult to ingellince taken...Believe me it is the first thing would ask anybody...Even myself!!!!...LOL!!!

To answer the question YES I reset the PCM.

 

Yes there is a MAP sensor on the 4.7. I can't remember exactly where it is however.