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Q:

misfire on 1992 BMW 750iL

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
low idle, misfires, burns rich, all spark plugs wet with fuel
(1) Answer
review when last tuned. it may be due.
rec. fuel system clean. ethanol treatment to 1 tank premium. ethanol blend in fuel causes build up in fuel system(possibly fouling injectors), combustion chambers. exhaust and causes increased wear to spark plugs.
get diagnostic run to find any other issues u need to be aware of.