Hi all. Hoping for some help. I have a compagno 50i and it went a little while without use. It started to studder at full throttle but is good up to about 3/4 throttle. I drained the fuel by running the pump, just took out and cleaned the fuel injector with brake cleaner and compressed air (while opening the injector with a power supply). Started right back up with the same condition. Any suggestions? I didn't see a fuel filter but didn't dig. Air filter is clean. Scratching my head in this one...