Hi Michael,

Your effort in posting the scope results deserve some sort of response. So here goes. I don't own a smoke tester but I find easy start or carb cleaner squirted carefully over the suspect area works for me. I am not familiar with the scope you are using but MaF looks ok although you have a double image. Perhaps you blipped twice. HO2 sensor at idle looks lazy but OK when revved. Not sure what KOER is but I assume looking at the trace you have blipped the throttle which has produced a small glitch on throttle opening. This could be a sampling error but not to be discounted. Throttle body and throttle plate clean is a must. Worked for me a few times. Emission figures will be interesting which can rule out/in various faults.

Regards

Pete M