My 89 420 sel has a miss at idle. Ive checked everything and found that injector to have less fuel from the distributor. Iam guessing theres a chuck of crap in that hole from the distributor. Iam about ta open the distributor and try to clean out the orfice. Cant seem ta find an exploaded view anywhere. Been a shop owner for thirty five or so years, and its my car so I aint scared. never had one of these apart. Is there a rebuild kit? Do I need one? Is it a waste of time? The car has less than 100,000 miles on it, so Iam thinkin dirt rather than worn parts...what ya think?