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94 30 Mercruiser back fires out of carb

M

marineman43

Contributing Member
"Here is what I did...
Instal

"Here is what I did...
Installed new fuel pump and rebuilt the carb (Mercruiser carb)
Had to reinstall the distributor to set timing back up.
IT will start and run fine but idles way high.
Also when I gas it real fast it will backfire out the carb then idle low,then when I gun it again it will backfire out of carb then idle high again.

could this be in timing ,carb or both,never had these issues before.

Thanks Mike
291670.jpg
"
 
Idles way high - too much timi

Idles way high - too much timing or a vacuum leak

backfires out of carb - aka the "lean pop" - carb cleanout not successful or vacuum leak.

See if a vacuum gauge shows a leak.
 
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