noelschembri
Recruit
- Joined
- May 16, 2006
- Messages
- 3
Hi, Ive got this merc 9.9 which is starting and idling properly, then at full throttle it starts misfireing and knocking. I cleaned carbs, replaced plugs and still same. compression is 75 lb/ sq in on both.<br />please help<br /><br />thanks