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will a bad intake manifold gasket possibley cause the back fire thru throttle body and make it hard to start due to compression/vacum problems

Did both, when we tried to get codes off the boat it didn't bring anything up.......We have called the president of the Volvo Penta company and he was just as puzzled about the situation. What does this backfire from the throttle body when we try to start the boat sound like though? He did say...

My friend and I have been working on a v6 4.3 Gi Volvo Penta Princecraft for a good month now. The people who own the boat got water in the fuel system somehow and it basically wiped out the whole engine. We have changed the map sensor, TPI, IAC, Ignition module, rotor, and fuel pressure...