didn’t pump out all fuel, was told it was winterized properly! Not much fuel was in there I just put in 94, being the highest fuel pump fuel we got up here in Canada, I’m thinking if it’s bad fuel wouldn’t both motors be experiencing same issue?

Why not try switching carbs?

What rpm are they at in neutral and what rpm when put in gear?? What kind of carbs??
Probably just needs the idle air bleeds adjusted or maybe just the idle rpm.

idles just under 1000, not sure the exact carbs will look today

Two years of sitting for Holley carbs, the carbs will need to be pulled apart and cleaned. Easy peasy.. I do 5-10 a year. Just one last week. Ski boat, sat last year. Week before 502 w/BG 850. Litte over 12 months ?

Make sure that shop set timing by total timing method, not initial. Performance motors with spring type centrifugal advance some times are already advancing at idle.

I’ll pull it off giver a clean today! Thank you

Make sure you use red straw and blast both ways thru the top air bleeds 4 per side. 2 are idle and 2 are high speed. Some miss this for some reason. Watch your eyes, carb cleaner will squirt back at you. Compressed air after doing this is better. As after spraying thru (both ways) all holes in metering blocks and bodies.

Best way go set idle mixture screws are in the water, engine fully warned, and in gear. Typically best idle in neutral will need screws opened (counter clockwise) another 1/8-1/4 turn.