Hi, lately my 87 gn has been idling high but now its accelerating on its on. I did a complete stop an as I got off of the brake it slowly accelerated to 37 mph on its own? I've tried resetting the computer as well as bumping the accelerator a few times hoping to unstick still nothing. When driving I notice if I was doing say 35mph it would stay 35 or up to 36? Any idea's??? Thanks.... Is it the TPS sensor?