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You didn't mention any work on the ignition system. Because your mechanic did so much work on the FI system, I would go over the ignition system thoroughly. Check the resistance of all ignition and coil wires, making sure that all the terminals are good. Look for cracks or worn terminals in the distributor caps, and if they have any wear at all I would replace them and the rotors. While you're in the distributors, I would ensure that the distributor belt is good. The spark plugs should be replaced unless they're nearly new. In any event, check the gap of the plugs. Make sure that they're the appropriate plugs for the 3.6. I would also check the ignition coils, as weak coils can cause poor running. I have compared coil resistance against new coils, but unless you have access to new, identical coils, bench checking coils is difficult. Other things that come to mind are fuel pressure, valve adjustment, and the head temperature sensor. Obviously, the fuel pressure can be checked while running, and the CHT sensor can be check with an ohm meter without removing it. You might also check the continuity of the idle and WOT switches on the throttle bell crank. Also, cleaning DME relay contacts might not hurt either. There are other things to check and verify, but that's what comes to mind right now.
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