1989 85hp Chyrsler Force outboard. Can't read model and serial numbers. Just last year I've had new impeller put in and carbs rebuilt. The engine starts out fine, but about 5-10 minutes of crusing, it starts to misfire, but only above about half throttle. Idle runs fine, up to midrange and then the misfiring starts and she bogs down until I cut off the throttle. I've changed plugs while out on lake, and the misfire is still there as soon as I take off. I'll bring it home, let it sit overnite, and bring it back out and it will start out exactly like the day before. (misfiring about 5-10 minutes into outing). Runs great at full throttle, but only for those 5-10 minutes, then the misfiring starts.<br />Thank you for any help.
