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I just solved a high idle problem on my 740 today. I thought it was the TPS, but it turned out that the linkage between the throttle cable and the Throttle body just wasn't allowing the throttle to close quite completely. So if you decide to look into the TPS, try this first.
Disconnect one end of that little rod that goes from the Throttle body up to the pulley the throttle cable moves. It has a socket on each end that goes over a ball. To disconnect, take a small screwdriver and pry out the little plastic catch at the end of the rod then the socket can be popped off the ball. In my case, with that rod disconnected the idle slowed right down because the throttle could now close completely and the TPS could sense that. Turns out that rod can be adjusted by screwing those socket ends out.
You need to disconnect this rod anyway if you are going to remove the throttle body and you really can't work on the TPS without removing that, so stop at the point of getting that rod disconnected and restart the car. You might be done in five minutes like I would have if I had been smart enough to do this BEFORE before removing and reinstalling!
I don't think this problem could explain your plug fouling, but I wanted to pass the tip along.
Andy
'91 745 183K, '89 244 134K, '87 245 lost the rust battle at 225K
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Andy '91 745 184K, '89 244 134K, '87 245 lost the rust battle at 225K mi
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