My ignition module went out on my mercruiser so I went to the local advance and got a gm ignition module since that's what was stamped on the block (gm) I figured it would work well the guy gave me a ignition module for a 350 engine and I put it on and it started up it just now will not go over 2700rpm but in neutral it will rev up no problem I'm thinking maybe the v8 module is throwing the timing off but I'm not sure my question is can I use a gm module or do I have to go to a marine store and buy one for the mercruiser? Please help