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Was looking for the total advance on the ignition. Wondering if module is not advancing. You should have a total advance of around 28-30 degrees by 3 k or so rpm. 10 degrees is correct for a vortec 5.0. yours is a 220 hp engine if you have a 1.62 drive the 19” should work fine If engine is in...

You say factory prop- what pitch is it and what gear ratio do you have in the prop. What is the total amount of ignition advance you have and what do the spark plugs look like ? Would also think you are heading for a carb rebuild but would verify what prop is on it as it may have to much...

No reason we can't have fun here...

You see a fair number of comments on Pertronix failing. Never had any first hand experience but might be worth a internet search. I see this a lot on the classic car forums I'm on. Delco EST is tried and true OEM quality system

This above when you split the halves to do the impeller east to misalign the shift shaft that is cotter pinned in the upper with the splines shaft in lower. Upper shift shaft needs to be straight ahead and lower shaft needs to be I think turn all the way clockwise to be in fwd

I mixture screw not idle speed screw. Idle mix screw is on throttle plate turning it in allows less fuel at idle turning it out allows more fuel at idle. The idle speed screw you reference is the stop that the throttle seats against this determines how far the throttle plates are open at idle...

How did u set the idle mix screw? When you stab the gas are u getting a good stream of accelerator pump shot ? What did contents of fuel filter look like Did u set the ignition timing

The 488/3.7 engines were a redhead step child . A lot of mechanical shortcomings in the design. If the boat is worth the effort swap in a3.0 or 4.3

X2 on the 19” as a good starting point. Might be better to rough in wot rpm with less expensive black max props

See attachment from factory manual I found it best to pull the inner core out, then push a weedwacker wire up the cable to the shift plate and tie it off, pull the cable outer sheath out through bellhousing. Use the weedwacker wire to guide the new outer cable up and around the exhaust and...

When it happens check spark strength with a spark gap tester to rule it out. I suspect you have a fuel delivery or carb issue. Prob a good carb cleaning will help, but would verify fuel pressure while its acting up

Would suspect the algee growth change is from something else as if stray electricity kept it at bay no one in marinas, which are known for stay current, would need bottom paint.

There may be a vacuum fitting plugged on manifold There is vacuum supplied through a small tube for the choke pull off Prob can put your gauge on there and just force the choke open Can also just tune it by ear or rpm when you go way lean and way rich it will stumble In Between these two...

Does it by chance have an older gimbal housing that A 2x4 across bellhousing will work as well

is this in gear or neutral - thinking gimbal bearing, ujoints or propeller

That would be a good sanity check . Also seen folks us a 1" pipe or dowel which wont be tight in the coupler but allows you to insert it and look in with a flash light to see which way it needs to move. Be interested to see if the tool is wrong as that would be easiest solution. Would also...

I only have a gen 2 trim wiring diagram but it looks like there is a 20 fuse in the red between where it takes power off the solenoids and supplies it to the trim/trailer switches at helm and trim limit switch. Weather it was there originally or someone added a newer fuse holder to replace an...

so if you have zero issues in three hours why did you insert clear hoses ?

there is a mercruiser procedure for centering the the gimbal bearing by inserting the tool and smacking it L, R, Up, down How far in does the tool go and what do grease marks look like ? I had to jockey my engine side to side when I did my repower Might be worth checking the tool dimensions...

the balls in thermostat housing are supposed to restrict flow of raw water to elbows, if they have debris could be passing too much water into exhaust starving the engine of cold water. Are you sucking air in at impeller if lower housing is corroded or water dam in there is damaged this can...