I'm new to the forum and have read some discussion on my problem but still not sure what's wrong with my 1989 3.0 Mercruiser 4 cyl engine. It won't start. I've drained old fuel and replaced with new. Installed new fuel pump, starter and solenoid, coil, points and condenser. Set points at .019". Getting fuel to carb and spark to all plugs but engine still won't fire or start. Makes no sense to me. What am I missing? Please help. Thanks. Mickstir