Running my 1993 Johnson v4 90/65jet have loss of power issues. Starts fine idles sweet my problem occurs at full throttle boats goes up on plane runs for a time(usually the same amount like 30 seconds) then a sudden bog like i lose 80% of power and come off plane. Almost like all a sudden no fuel, however bulb stays fine it doesnt appear to be starved for fuel. I also made sure tank is vented. This occured awhile ago where it appeared engine was running at only half power all the time. Power pack and plugs were replaced and was told coils are fine. Where would be a good starting to point look? Its almost like it gets hot reaches a temp and shuts down can something be sticking?