Brief history...I took a 4150 off my 557, and put on a 2 circut 8082, first time out I lost 300 r's with no other changes. From there I pulled a couple of plugs(looked rich) transom was also blacker than normal. Sooo I dropped 4 jets in the secondaries, and put on my dry headers with a wideband 02.. Fast fwd to today boat seemed to run fine while in the primaries,seemed to rich at cruise 12.5-13,but as soon as I'd stab it it would go scary lean for second(like off the wideband lean, and just ran like chit. It was prolly 13.5 ish at wot. The weird part is when I eased off the go pedal it would clean up and run better/faster. Is that because vac increased and the pv richened things up or??? I guess I'll jet it back to where it was but ...even that ran worse than the smaller carb. Any sugestions???