That's what I thought it was supposed to be. I think the change in idle is from the new jets. Still can't for the life of me figure out the issue with the 4.5? Has me really confused like I couldn't even get it to run like at all and idling was out of the question.
The only issue that needs fixing really is removing the stumble when you step on the gas. So will the 8.5 help with that over the 6.5 or give me the opposite effect I am after
Changing main jets has very little effect on idle mixture. Changing the power valve has none.
On my son's 240 ci inliner we found that the stock 390 jetting was just about perfect. But the accellerator pump circuit was too lean. We had an off-idle stumble. We changed the pump shooter from (I think) #25 to a #37 and it made a world of difference. You may want to change the pump cam to a larger one too. It somewhat depends on the rest of the drivetrain - stick or auto, hi stall converter or stock, etc. Good luck.
