Ive got a 91 prostar 190 and it seems to running rich all of the sudden.I bougt the boat a few months back and it ran fine untila few weeks ago. I started it up to launch and it was rnning really rough. It left a black mark on the side of the boat. I adjusted the air/fuel mixture screw on the carb to 1 turn out. Still runs rich. What else would do that. The carb is a brand new holley for the 351? Any suggestions?
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