im just curious if this is the same "stumble" that i have. seems like somewhat of a misfire at around 2600-3000rpm? as that is a problem i have been having for the past year but never consistantly. i asked here and there but nobody acted like they had a clue what i was talking about. i replaced the pump, one bad coil, spark plugs, and tried using specific brand fuels all with no elimination of the problem. i was thinking maybe an injector problem and was going to send them out for refreshing, but if i can spend the same money and actually fix the problem then im in.