I changed to a new JDM engine after my old one overheated. I used the same TPS on my old engine but it runs rough and won't rev past 2000rpm so the engine keeps pulsing at and below 2000rpm. However if I disconnect the TPS, it runs fine and revs past 2000rpm normally but now the check engine turns on and it can't past smog in CA.
Different airflow meter calibrations,do you have the z32 airflow meter installed?
SOURCE: 2000 bmw 320diesel ,won't rev
check exaust might be stoped up also could be fuel injection pump
SOURCE: rough idle
Have you had the throttle valve cleaned?
Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: 2000 ford focus stall/loss of power while driving
i ran into this with my focus. It turned out to be a loose connection on the crank sensor. It started right after i changed the serpentine.
SOURCE: 92 chevy truck 5.7 idle revs up and down high emissions
sounds like a vacuum leak check hoses and manifold
SOURCE: won't start, engine wont rev above 2000rpm
Have the alternator tested. You are providing a low charge to the battery when you jump it and when taking it above 2K RPM requires more amperage resulting in the engine dying and the rough idle
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