Car runs fine for first 8 to 10 miles, then starts to miss at lower rpm. You know when you're slowing down and don't want to downshift, the car should be able to "lug" just a little - well it just won't do it. If I downshift so that the rpm's go up - it'll run fine. I've replaced the plugs, rotor, cap, wires, swapped the Coil, AMM, ECU with parts from a parts car - it is an automatic so I can't swap the ICU I don't think. It feels like the timing is "jumping" drastically or something like that - really doesn't feel like fuel is cutting off. I've held on to the fuel pump relays while the miss is occurring and they don't seem to be clicking off and on. I have the correct number ICU on the way to check that out - that's about the only thing left. Another theory, could the Hall Sensor give this kind of trouble? I figured it would either be good or bad - not in between/intermittent. Help!