I was wondering if you needed to clean the throttle body, and all linkages on the outside, see if that helps. They do get gummy after a while. Barryman's Carb. cleaner is a very good brand to use. I wish I got a commision from them, as often as I have recommended their stuff........lol. Also check all of your vaccum lines. I had one that went to the cruise control get a small hole in it...........the wife stayed on my case until I found the leak, and fixed it. She drives it to work everyday, and loves her cruise control. I even tried to use the excuse, it's a Jeep honey, what do you need cruise control for?,.... but that didn't work.