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Yes, it does seem unusual that the carbon on the spark plug tip would have prevented combustion, but I've seen this on my motorcycle as well. Replacing the plugs corrected the running issue, but of course the greater problem is why the plugs are fouling. I need to check the battery for 14 volts at speed as Dave suggested. Why the voltage regulator would cause a rich running solution is a mystery to me, though. If you haven't seen the Bosch Platinum plugs, they are different than the standard plug...the electrode is very thin, and doesn't stick above the ceramic. Seems like it would be easy to foul given the reduced amount of exposed electrode surface area. Jim, your idea of checking the FI relay ground was a good one, though. I was playing with the screw a bit while the engine was running (maybe not the best idea?) and heard it engaging as the ground was interrupted. The relay I must've heard was actually under the dash, though, and wasn't the cause of the issue. Still, I cleaned up a few different grounds and wire connections, which may have helped. Yes, I was referring to the FI idle adjustment screw...I guess I was using carburetor terminology when I said "bypass screw". I also need to check my spark plug wires. When changing plugs one of the wire ends fll off in my hands...I screwed it back on the wire, but it still didn't seem tight. Of course, the real cause of the problem is the fact that just the day before I called the Fasty "my most reliable car" ;-) - Doug :-) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~