I have a 87 merc v-6 with a Alpha 1 outdrive, using a single lever shift control. When I shift with the engine off, it is a nice smooth transition. As soon as the engine is running, it will shift into gear just fine, but won't return to neutral without using great force to do so. I have tried all adjustment as stated in the manual. After adjustment it agian shifts fine without running. As soon as you start up the engine, it's right back to the same old problem. Is my problem with the shift cable from the engine to the outdrive, as I beleive it is?