slowride56
New member
Hello Forum, I have a 90 efi 4 stroke Ser# 1B475763 I bought this motor knowing it had fuel issues. Replaced both pumps and float checked hose and cleaned regulator, flushed out injectors and rail, new filters. engine starts and runs if you give it some throttle, fuel psi is 42-44psi. has good compression and new plugs. Took it to the Lake it runs fine above no wake speed real smooth no issues, but when you throttle down to no wake speed it start to get a little rough and then shuts off like you turned the key off. starts back up but barely idles. I checked the IAC valve and it appeared to not be opening all the way when energized. So i replaced the IAC valve and MAP sensor. Neither helped my situation. Leaning toward injectors anyone have any ideas?