i have a 115 johnson,j115tslecm. i was running fine, after about 15 minutes it bogged down. it would idle great,but everytime i would get on it, it would bog. i replaced all the fuel lines, blew out the carburators, inspected the diaphram in fuel pump, put fresh gas in it, and now it gives me fits to even crank. please help guys. or girls. i am at my wits end.