Just bought this motor used from a repair shop. Got everything hooked up, engine fired right away. It was idleing a bit high so I shut it off to adjust throttle cable down. Now, the motor floods up right away and will not even pop. Checked spark on all three cyl, good. New gas tank, new gas line, new gas. I can bring it back to the place I got it for warranty, but would rather keep it on the boat and hope it is just something small. Any suggestions very welcome!!!