Hi gents,
On my 2000 Ram Van, while in park, my RPMs kind of fluctuate. I haven't gotten the chance to poke around on it to see if I could come up with a theory, but I thought I'd hop on here real quick to see if anyone had an idea where to start.
It doesn't seem to have the issue when idling in drive... only while in park.
Any ideas?
Thanks in advance,
Matt

 

This happened to me this past summer. I replaced the TPS, reset the PCM, and the issue went away. This can also be caused by a vacuum leak, which I did first check and did not have one.

 

Thanks!
I have a spare IAC valve, but not a TPS. Maybe I’ll replace both just to be sure to cover bases. I guess I need to check for vacuum leaks too.

Is there a less redneck way to check for vacuum leaks besides the old “spray hoses with starting fluid and see if it idles up”?

 

Yes there is: