I Have a 1988 V8 350 with the OMC out drive. The problem i have is when i put it in forward gear just idling in drive i feel what appears the drive to be knocking in and out of gear. Once i give it throttle it knocks hard once then runs just fine at higher speeds. Not sure what to look at first any help would be appreciated. Not sure if it is the dog clutch or what it is.