Poor idle only with full tank of gas

bman1bpm

Chief Petty Officer
Joined
Jul 19, 2004
Messages
450
I have a 2001 Merc 5.0 with thunderbolt V ignition, carburetor engine. The last two times I've gotten a full tank of fuel the idle is terrible when in gear. It barely stays running. It has been fine once I burn up some fuel. Different fuel docks each time. What gives? Is it possible to overfill a tank?
 
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