Surging when warm
I have a 92 SSEI that runs awsome when driven short distances, but when driven for over a couple of hours I have a surging problem under any kind of load, part throttle and full throttle to the point where I could not quite crest a long gradual hill. The longer I drive the worse it gets. If I cycle the ignition the problem seems to improve for a short time.
I have removed the cat,replaced the plugs and wires.The coil was tested and ok. Can anybody help me out here I'm running out of ideas?