Lower Unit Issue? Just purchased an older bass boat year 1982it has an Evinrude 35 hp ( E35ELCND ). The Motor runs really well, when I had it on the muffs checking things out I noticed it would not go into forward gear. I found that the fuel line had been shortened causing it to lay under the shift lever. Fixed that. Took it to the lake right of the bat would not go into forward adjusted the cable, no problem. forward and reverse gears lock in solid, no prop slippage. But when I start to accelerate at approximately 1500 - 2000 rpms (just a estimate no tach ) I hear a thump sounds and feels like you just bumped a stump or something. No grinding stays in gear at full throttle, just one thump. Could it still be a adjustment issue? Or clutch? It's really puzzling it only happens at the beginning of acceleration and no other time. Any input is appreciated.