Hi John, you mention that you don’t have a misfire, but go and look at timing data, if your tool allows you to do so. I feel this is a coil problem and the timing is retarded by the ECU although you don’t have a misfire or codes for a misfire, every situation like this we have had has been cured by new ign. coils, for some reason the software engineers haven’t written codes for this situation. I posted on this situation a while back with very similar problems.
John Kennard.