Ok, this is the last season for this boat. So I would like to get it sellable. Twin mercruiser 3.7LX 470 engines. Both replaced with remans in the last year and half. The newest of issues, is driving me nuts and cost me over 1.5k in mechanics thinking they fix it and never do. Here is what is going on, starboard has no issues at all. But, port will run perfect for a few hours then out of nowhere it starts acting up. The Rpms jump up and down by 2-300 RPMS. like its either loosing spark or starving for fuel. it will run smooth for a couple seconds then drop in rpm for a second then run good for a couple secs. and It will stall out at idle. And if you try to gas it past 2500rpms it just bogs out. This has happened every weekend for the last 4 weekends. And I have a mechanic look at it each time and say they fixed it with either a timing change or a cutout switch adjustment. Or some other thing that didn't need fixing. But the issue keeps coming back. The fuel pump is new, the carb was rebuilt 6 months ago. Anyone got somewhere to look next time its doing it. As it works fine when the mechanics go out there. And I am sick of throwing money away on guesses. Intermittent problems are going to make me go insain. Its beyond belief how many things have gone wrong with these 2 engines and the 2 that they replaced..........I can say I easily spent 30k over the last 2 years keeping this thing running. And that don't include any cosmetic stuff I did, that's just on the engines and components. So far I have swapped the pertronics, replaced the rotor and cap, checked all grounds and positive wiring, replaced plugs and wires, swapped carbs, and the issue keeps coming back. each trip was different, first time it ran for 5 hours without issue until it dropped to idle then it started doing its thing. The other times vary from 30 minutes to 3 hours before the issue starts up.
