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the rythmic swaying sounds like one dead cylinder to me... pull the injectors and do a compression test.
you may also want to crack the injector lines while it's idling and see if any pots fail to alter the idle...
black smoke is incompletely burned fuel... air filter clogged? has the alda been adjusted?
if the thing is swaying, your motor mounts are in need of replacement. shocks too.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!
My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!
1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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