So I've been trying to track down an idle midfire for months (if not years?) now.

[Keyan]

I want to get tuned by Pampena but I want this fixed first.

It misfires at idle (just a slight pop in the exhaust). It never really concerned me when I was on the stock ecu, but ever since I put in chrome (obd2) it throws a p0300 all the time. If I reset it, it comes back in 2 drive cycles. It doesn't seem to misfire while driving (or not to my knowledge).

List of things I have changed:
New coils
New PTU
New wires
New plugs
Rebuilt engine (wiseco pistons, lapped valves)
93 ecu -> chrome ecu (misfired on both)
vehicle has a DLI, runs the same with or without it connected.
relay for the coils to get b+ when key on
New injectors
No vacuum leaks
New crank sensor (broke the old one rebuilding the motor)
valve timing is on.

The vehicle has a maft and a 3.5" maf in blow-though just before a 90* at the throttle body. To my knowledge, my car had the misfire when it was also on the maft+safc combo, and I do remember ray had to pull out like 12% on the safc with stock injectors to get it to not run lean. I am thinking maybe the maft or maf is bad.

Is there something I am missing?

[Chris@Rvengeperformance]

amuse me and set the dwell limit to 90% and raise the dwell settings 15% over their current values.

[Keyan]

limit is already set to 100%. you mean change the other dwell settings +15% as well?

[NOMIEZVR4]

amuse me and set the dwell limit to 90% and raise the dwell settings 15% over their current values.

Yeah could you clarify a bit more please? I recently made the change from 75% to 100% per the advice Greg gave you in your thread. Is there another table that needs to be adjusted as well?

[Chris@Rvengeperformance]

yes, change the actual dwell settings under coil dwell time vs voltage. Jester has tested 125% of the stock values, I'm just being a little conservative at 115%. Idle and cruise is smoother.

[Keyan]

I will try that this afternoon. I am on the ledge about it however, because I have a DLI which does the same thing, and it hasn't helped. Hopefully it works.

[Chris@Rvengeperformance]

I don't think anyone knows how the DLI really works. It is the one thing I never liked about it.

[Greg E]

Time for a compression test.

[Keyan]

compression is fine. the motor was rebuilt already.

[Greg E]

Something is causing that crank to spin unevenly. You've ruled out fuel, spark, timing and AFR. Only one thing left to check...