Engine won't idle
You guys are the best. So far you've helped me replace the impellers of two completely different water pumps, replace exhaust pipes, replace rotor, distributor cap and spark plugs, replace serpentine belt. Both engines running, moving water, and staying cool. However, (there is always a however), the port engine will only run at 1000 rpms or more. Soon as I back down the throttle it stalls. It also back fires sometimes when starting. Oh, it's a mercruiser 4.3 with bravo 2 sterns.