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Saw your previous post below, saying you already replaced FPR. If you are sure the FPR is still OK, then I would suggest swapping the main fuel pump, unless your problems are solved by the sock cleaning. . If it were my car, and this didnīt help, then I would swap the AMM with another healthy car of same model. I once had a 740 non-turbo, where some crud was burnt onto the thin filament in the AMM (I guess it was an insect getting in there just during engine shut-off when supposedly the computer makes the filament glow, to clean it). This was pretty tricky to scrape off, using a good magnifying glass and great care.
Freaky, Huh?
Good luck
Gustaf
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