Undiagnosed stalling concern

[Charlie T]

Originally Posted by LaFuga

I'm feeling the same except there's no way I'm paying them another penny... Seeing I just bought the boat, it's nice to know I've got all these parts replaced now, but the next attempt has gotta be on them... I've been very patient and respectful so there should be no argument they need to make this right by no more charges

It sounds like you need to find a real "Technician" vs just a parts changer who is using your money to throw parts at the problem in hopes of hitting the problem.
I'd give them another chance with the understanding that you are paying for no more unneeded parts and labor. Did you hopefully pay for the previous repairs with a CCD?