I own a 01 Jeep Wrangler 4.0 (5-spd), I'm having a problem with the accelerator sticking. I spray out the throttle body and that helps short term, but now at times it's sticking at 5000 RPMs!!! Thats happened twice. Is this a throttle body problem or maybe a idel air intake problem??? I hear that a new throttle body is very expensive....any suggestions???