Hello everybody. I've got an 83zx non-turbo that runs at full power for about a second then hesitates and sputters for a second, at all speeds, all the time. It does not do this at full throttle but at all others. Recent tune up just highlighted the problem even more. I'm guessing it's a throttle valve switch or distributor or ECU or cat. converter but I'm only guessing. I would really appreciate any input on this problem and will happily share the outcome with everyone. Tom.