Originally Posted by SonicVQ

Well, since you asked



If that was my car, I would use a good/fast wireless OBD scanner (OBDLink MX+, VeePeak BLE) and a good OBD app, like OBDFusion (or OBDLInk) and datalog:



• Cylinder #1 ignition timing

• Engine RPM

• Vehicle speed

• Short term and long term fuel trims for each bank

• Engine coolant temp

• Intake air temp

• Absolute engine load

•*O2 sensor lambda bank 1/2

• Mass air flow A/B (Bank 1/2)



(Note: OBDLink MX+ can read about 40 PIDs/second, which results in about 4 samples per second per PID)



Log the data on different days and make of note of when you think the issue is happening.



Then, post your log file here and I will have a look. As a VQ specialist, I have been reviewing data logs for the last 5 years and have a good idea of what the "expected" values should be, for different driving conditions.



If the above is not too much effort or cost, it might shed some light on what is going on.