Random misfire, high idle

[huafist]

Ok, first off, I KNOW I have a leak somewhere ; I can't get the car to idle down under 2k, even with the BISS screw turned completely in. That's annoying in of itself, but it's not my primary concern at this point.

My problem is, the car will randomly start to misfire ; the ECU goes into open loop, and it won't stop misfiring until you turn it off and start it back up, at which point it's normal again. It seems to do it more so under a heavier load, and it doesn't do it all the time. Ignition system is as follows:

1G CAS (coil packs and injectors repinned, DSMLink set to use non 95-96 CAS)
Stock coil packs
NGK BPR-7ES, gapped at .028
Taylor 8.8mm wires

Other mods:
Kelford 272 cams
EVO9 Beehive Springs
Greddy UICP
Greddy Type RS BOV w/recirc kit
Balance Shaft Elimination
Forced Performance Cast Race Manifold
Precision SCM-6031E Turbo
FP 4" intake pipe
3" exhaust from O2 housing to muffler
ACT 2600 Clutch
FIC 950cc Injectors
DSMLink v2.5

I think that's it for the major mod list.


I'm attaching a log - you can see where the problem starts around 165.795 seconds. I'm not sure what the issue may be at this point.

 

[92AWDHX40]

Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)

above may help even though its not surge
biss, throttle cable, boost leak, throttle body, check those out too.

 

[huafist]

Thanks, I'll look through it.

Throttle cable is adjusted properly, I just rebuilt the TB with new shaft seals, and put a new O-ring on the BISS because it was leaking during the last boost leak test I did.

I'm an idiot.

Dave Mertz from ECMTuning reminded me of the random misfire deal with the 1G CAS. I have solved the issue now.