Dropping cylinders at 2200 rpm and after it warms up dropping them at 4400. Seems to change with the temp. In any case cannot get to 6500 unless babying the throttle. Have exchanged ECU, mass air flow, tested throttle switch, engine temp sensor, crank sensors, everything we can think of. New coil and fuel filter. Pulling hair out and don't have much more I can spare. Thanks, G

 

what's your residual fuel pressure?

 

Don't know the actual though the rail pressure is in limits

 

Had a like issue in a car that was spiking fuel pressure...the FPR was fine for about 10 mins and then let the pressure climb. I kept thinking it was related to engine temp but that was coincidence.

 

Was it the signal to the FPR or the regulator? Thanks, K