I have a 1984 Mercruiser 140 3.0 that I am having a issue with. So the engine will start and run fine on a hose, sounds good no knocking or any out of the ordinary sounds. I can give give it gas and it will do just fine. Once I put it in gear and give it gas it will spit and sputter but will accelerate. Once I put it in the water I can start it and it fires right up and sounds great. Once I put it in gear and try to accelerate it falls on its face back fires thru the carburetor and dies. It will start right back up and still idle great. It will only die when accelerating under a load. So far we have checked the fuel pump and it is fine, replaced the ignition coil, points, distributor cap, rotor, spark plugs, Checked compression (Good), Set timing, fuel filter, changed gas out (even have it hooked to external tank), new carb, set bowl level to the book. Not sure where else to turn. Any help would be appreciated....
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