Not that I'm complaining but it's a freaking mystery to me and I'm just trying to sort out what I did right.

I have a 2k SE MT. No engine upgrades. Exhaust is Catt headers and pipes to stock muffler. SAFC and anti foul on last O2.

During normal driving on the way home yesterday and at a stop sign, the RPMs drop, the SES light comes on and the RPM surges and stays at ~1k.

Pull away from stop sign about 8 miles, I get the loss of power, will not rev beyond 2,500, shudders after 40 mph.

I get home and pull both codes.

Today, I took out the air box and MAF. Cleaned box with warm soap and water, MAF with CRC MAF cleaner.

Removed and cleaned two post grounds left of oil filler cap.

Volt, ground and continuity tested MAF, coils, coil harnesses, condenser, ECM - all ok.

Reinstalled air box and MAF with new air filter.

Started the car and the SES light is gone and no codes (yet).

 

sounds like you fixed the issue.

my guess would have been to check coils and maf.

by the way, can you rev past 2500 rpm now?

 

Yes. It's running pretty normal but I think it's not as 'snappy' as before. I'm not certain tho. It could just be imagining it.

Although I still have to check the PN of the ECM to see if I need to do the MAF/ECU relearn.

 

The first time my car had these same symptoms was about three years ago. I can't recall the DTC I pulled but I remember replacing the MAF.