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1978 90 HP tower of power out of power

Gene1954

New member
Just purchased this boat. put new gas in tanks..treated..was a little hard starting then it started and idled fine. Took off into the Ohio river..boat took power real well. Ran about 10 minutes and it started losing power. Finally it stalled. Could get it refired with the help of starting fluid. Finally got it to move but at full throttle it would only putt along around 10 MPH. As soon as i put it in neutral it stalls. The boat had set for a while but idled out great and had plenty of power for 10 minutes. Any suggestions. Maybe coil?
 
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