rough running 1988 50HP Mariner

mcgurk34

Cadet
Joined
Mar 3, 2004
Messages
22
The engine is not running smoothly at any RPM from Idle to WOT. Good compression (125 PSI) in all three cyl. I've recently replaced the three ignition coils and the electronic control module to repair a no spark condition in number one cyl. Starts and runs OK but somewhat rough, like its missing on one cyl. Plugs look normal. Any ideas?
 
Top