When the engine is cold, it drives fine.
When the engine is partially warmed up, it drives fine but at idle it surges +/-150ish rpm (doesn't do this when cold)
When the engine is fully warmed up, it drives fine but if I clutch in (at any speed) the RPMs drop to 800, then bounce between 800 and 500. If I clutch out it acts exactly as it should. If I remain clutched in (e.g., coming to a stop) RPMs then dip to 300, bounce between 300 and 500, then a few seconds later the car dies. It starts right up on the first turn of the key. No drivability problems, boost fine, everything is fine, shifting is fine, it's just if I stay clutched in the RPMs drop down to idle RPM, then dip lower, surge, then the car dies.
If I turn the car off, let it cool down for 10minutes, it's okay for a few minutes (temperature gauge is no longer indicating it's at full operating temps) then it begins surging again whenever I stay clutched in (starts once it reaches operating temp)
My datalogger says battery voltage is constant (13.x-14.x volts until it dies, then goes to 12.x), no trouble codes to read. I reset my tune back to stock and had the same problem (checked just incase it was tune related).
Reserach shows me IAC is a possible cause, but there are plenty of google links with the exact same symptoms who replace IAC, TPS, spark plugs, and still have it and eventually have to get it tuned out (which makes no sense because my tune is fine and has been rock solid ever since I got it, so if I had to tune it out, that would mean I'm just masking a problem)
When the engine is partially warmed up, it drives fine but at idle it surges +/-150ish rpm (doesn't do this when cold)
When the engine is fully warmed up, it drives fine but if I clutch in (at any speed) the RPMs drop to 800, then bounce between 800 and 500. If I clutch out it acts exactly as it should. If I remain clutched in (e.g., coming to a stop) RPMs then dip to 300, bounce between 300 and 500, then a few seconds later the car dies. It starts right up on the first turn of the key. No drivability problems, boost fine, everything is fine, shifting is fine, it's just if I stay clutched in the RPMs drop down to idle RPM, then dip lower, surge, then the car dies.
If I turn the car off, let it cool down for 10minutes, it's okay for a few minutes (temperature gauge is no longer indicating it's at full operating temps) then it begins surging again whenever I stay clutched in (starts once it reaches operating temp)
My datalogger says battery voltage is constant (13.x-14.x volts until it dies, then goes to 12.x), no trouble codes to read. I reset my tune back to stock and had the same problem (checked just incase it was tune related).
Reserach shows me IAC is a possible cause, but there are plenty of google links with the exact same symptoms who replace IAC, TPS, spark plugs, and still have it and eventually have to get it tuned out (which makes no sense because my tune is fine and has been rock solid ever since I got it, so if I had to tune it out, that would mean I'm just masking a problem)