This problem occurs under speed as well as at idle. I've got a manual trans. Occurs in gear, with clutch in, and in neutral. I don't have injector resistors, unless they are internal to the ecu. And work is crazy right now, so I have no time to work on car. Still need to check wiring from connector on passenger side to ecu (for the secondary resistor). Still need to check grounds on engine and trans. I know the ones at the thermostat are good, but ran out of time for the others. Hopefully will have time on Sunday to look at it. Thanks so much for all of the suggestions. And I have swapped out a known working throttle body, complete with eacv, tandem air control, injectors, and throttle plate. Still had the same problem.