Agree with EOD. Really surprised that you didn't mention anyone scanning the car. You can't do anything without doing that first. I second the Foxwell 510. Mine goes with me everywhere. Stop firing the parts cannon at it and slow down with proper diagnoses. I don't see anywhere that you replaced the spark plugs? My 05 had a misfire, I scanned it and saw which cylinder it was. Swapped coils first, no change so obviously plug.

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Dave S.
Northeast
2003 4.6is
2005 E53 4.4
2003 E39 Msport(a REAL ONE!)
1959 Fiat 600