My 2000 Jeep Grand Cherokee will cruise nicely at 70mph but will sporadically rev up an extra 150 rpms for a second or two. This results in a slightly perceptable surge forward. It happens whether the cruise control is on or not, at different speeds (although less noticable), with the A/C on or not, and whether the OD is on/off.

It appears to happen more frequently with slight resistance such as a gradual long up hill, a strong headwind, etc, but it isn't perfectly matched to these conditions either.

There is also an idle condition that may be related. After a highway trip the idle will surge between 650 and 1500 rpms on its own.

Any ideas to put me in the right direction would certainly be appreciated.

My 2000 Jeep Grand Cherokee will cruise nicely at 70mph but will sporadically rev up an extra 150 rpms for a second or two. This results in a slightly perceptable surge forward. It happens whether the cruise control is on or not, at different speeds (although less noticable), with the A/C on or not, and whether the OD is on/off.

It appears to happen more frequently with slight resistance such as a gradual long up hill, a strong headwind, etc, but it isn't perfectly matched to these conditions either.

There is also an idle condition that may be related. After a highway trip the idle will surge between 650 and 1500 rpms on its own.

Any ideas to put me in the right direction would certainly be appreciated.CHECK OUT YOU THROTTLE POSITION SENSOR< IF YOU EMAIL ME DIRECT I'LL SEND YOU A ARTICLE ON RETERIVEING THE TROUBLE CODES & WHAT THEY ARE. THESE ARE IN MY FILES & I CAN'T SEND THEM THRU THE FORUM DALE jeepman600@aol.com

Had a 1990 Caravan that did the same thing. A simple idle adjustment was all the dealer had to do.