Check fuel pressure at the rail.
Ive found most marine motors manifold pressures are a tad lower than autos
Its list each cylinder but no actual numbers so no misfires
Welcome
What is your motor serial number?
I'm not seeing any misfires but have you replaced your distributor cap and rotor? The caps are well know to look good but be bad
I've never pulled a motor by removing the screws holding the mount, always removed the top nuts and rear bolts. It might be easier to do so I just have never done it that way
Sorry to hear about your issues, but have to think about it's a 20 year old now. That said I have a 2023 and the quality of Chap is bad, I call mine a Craparrel
It works the same way, only issue is will 50:1 oil mix flow correctly thru the injectors. My guess is yes but it's not my motor
Mix 50:1 in fuel tank and disable pump
Anything Cobalt should be a good ride, there heavy
The B3 is real nice for docking, it bites real good.
If your going to keep it in the water and attached to shore power measure the voltage coming from the Mercathode to protect the drive. If it's a trailer boat don't worry about it