First I want to thank previous replies to my problem!!! I am at my wits end after about a year so here we go. Problem started with cracked oil line that developed at WOT. Engine sucked air between tee(where oil and gas meet) and oil pump and died. Replaced line and checked compression in all six cylinders to be sure nothing terminal happened. Easy fix right? No way! Things just getting worse. Starts fine, idles OK, but when I Throttle up it justs bogs right down. As I said I checked Compression, Spark(jumps 3/4 in.) All check good with timing light so I thinking fuel problem.. Have fuel filter(new). New lines and pump ball. Took carbs apart after finding that three of six floats would saturate( foam type) after gas was in them for a while allowing needles to open all the time and allow to much gas. Replaced all floats with new(plastic). Cleaned carbs and all jets. I Replaced all needles and seats. Adjusted floats to specs. Link and Synced. Even did fuel pump diaprhram kit while at it. After all this I still bog at throttle up and can't get on plane. So i'm back to spark,air, or fuel issue. The only thing that I see is some fuel will shoot back thru carbs #1+#2 at idle and throttle up. Could reeds cause this as they look ok. This is a V-6 oil injected merc. I may need a great mechanic in Michigan!!