poor running mid range speed
I have a 75 Ski Sporter with a 2011 crate 350 in it. Runs great at WOT ( 4800 rpm) and at idle. When slowing down below about 3800 rpm, the motor seems to have a miss in it. Opening the throttle, it will speed up to 4800 rpm again and seem to run fine. Motor sounds like it is missing from about 2600 - 3800 rpm. I changed from Corsa Thru hull to Straight thru hull exhaust. This was when I noticed the miss in the engine. I have changed the plugs, wires, Distributor cap, rotor and the fuel filter. Motor has less than 30 hours on it.
Any suggestions
Thanks
Trevor