i'm not a fan of pulling the battery cable off to see if "???" problem exists. i feel it puts extreme shock loads into the system when either disconnecting or reconnecting, which can fry things you don't wan't too. and that is a REAL no-no on computer controled engines, which the lean burn is, abet a very primitive system. i much prefer getting out the digital meter and start checking things, then make a decision on which way to go from there.