Installed six brand new Bosch coils last night. It sure smoothed out the idle, with a very steady and smooth exhaust stream coming out the tailpipe. No evidence of a misfire at all now, except that it still gives me the P0301, P0303, and P0305 codes, as well as the P0420 & P0430. Took it down the road and it did fine until it warmed up after a couple of minutes, and then it started "lurching" and chugging whenever you put the pedal down for power or go uphill, same as before. Maybe not as bad though. The CEL had come back on and stayed on after I swapped the 1 & 3 coils a few days ago, but now with the new coils it is off.

Guess I'm back on track now to move forward with changing out the after-CAT sensors, then ripping into the DISAs. I think changing the coils was a good thing to do, given their propensity for failure on these models. Seems like a weird thing that they decided to go south just now in the middle of all this, though. Go figure.

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2009 X5 3.0
2001 X5 4.4 - Sold