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Hello my name is ***** ***** am I speaking with?
All Mercruisers are cataloged by serial number, can I get that number so I can see exactly which version of the 4.3 you have.
Next, what is the history on the boat/engine, have you ever personally seen the engine make full power?
Got it. This engine is MPI. It will likely have to get hooked up to scan tool in order to see what is going on with it. What kinds of questions did you have for me?
That is a statement, not a question, what kinds of questions did you have?
I work on hundreds of engines a year. There is a standard method to troubleshooting these engines that involves checking engine compression, checking the firing order, checking for a dead cylinder, checking fuel pressure under load, running the engine off of another fuel supply, and finally hooking the scan tool up to the engine to check for codes and to read the live data. All of that has to be done in order to find out where the problem is. (It is not likely a linkage issue).
Were you looking to get into doing some of that diagnostic troubleshooting?
This is going to be very complicated and you will likely not fix this even with my help. I can certainly type out a long list of things to check, but this is a pay website and we do not do this for free. That being said, did you want to continue, or call it quits and get a refund?