i have an 02 sport trac. i have noticed recently that the idle on my truck is really rough. it doesn't jump RPMs at all but when i am sitting at a light the whole truck shakes. i can't tell if its a balance problem in the engine or something else. it just doesn't seem right. it trys to push the truck forward. that is the only problem i have noticed with it. when im driving there are no other problems like that.