87 Force 125 Bucking at Idle

[bigmarc66]

Hey guys, Just got my boat going this weekend and my motor is running well. Went out for a ride and no problems, big relief. The trouble is that when the motor is in neutral and idling it runs normal for roughly 8-10 seconds then buck as though it wants to die, then recover and idle smooth for 8-10 seconds. The process repeats. If i raise the throttle in neutral or put into gear it doesnt do it at all. So I am not worried about it. Replaced the plugs still did it. Any suggestions. Thanks, Marcus

 

[Haywood123]

Re: 87 Force 125 Bucking at Idle

New gas?

 

[bigmarc66]

Re: 87 Force 125 Bucking at Idle

i ran new gas through it. I use portable tanks so i had no old gas anyways.

 

[maxum247]

Re: 87 Force 125 Bucking at Idle

Only other thing that comes to mind is a coil may be breaking down possibly.
Have you checked for a good blue spark on each cylinder? Good Luck! max!