Anyone else experience a rough idle after prolonged idling? If I let the truck run for 20 - 30 minutes in park, then the idle starts going all crazy. Surge about 300 - 500 rpm, then back to normal. Almost dies, then back to normal. Sometimes when I need to take a private call I do it in the truck and I let it run so I'm cool/warm and if the call is longer than 20 - 30 minutes then I start to notice this. Anyone had this problem?

 

took my truck in a month ago for a flash update on the idle and it didnt help. It still drops to just under 500rpm and then surges up to about 700 and then back down to just under 500 and so on. does it after its warmed up and just sitting idling in park. Doesnt seem to do it if im in gear parked.

 

Exactly. That's what makes this so weird:

1) It only does it in park. Not in drive or neutral.

2) It only starts happening once it's actually warmed up.

I am up to date on flashes....

 

Dont have my Ram yet but the wifes 09 Grand Cherokee (smaller V8) does this. I brought it to the dealer and they said it is normal... To me it is almost like the fuel injectors seem clogged or something. Almost like a cut in fuel. It bogs down then up, all between 400 -700 rpms....