Volvo Penta 5.0 PEFS bogging down on plane

[Andrecosta]

Good night, im having a problem since last season, my boat works great( 5.0 GI PEFS TBI ), but when im in plane for around 5 minutes straight ( 3.200rpm ) it bogges down and back fires on the port engine, sounds like cutting ignition, the tach drops to 1.5krpm and comes back with the back fires. I have to come out of throttle and accelerate again, but it happens again.

I have new spark plugs, wires, distributor cap, rotor, i cleaned the whole TB injection system, high pressure fuel pump. Already bought a new coil, but didnt installed yet.

Any thoughts of what i should do?

Thanks

 

[alldodge]

Looks like same kind of issue that happened to you back in 2022
https://forums.iboats.com/threads/v...not-going-over-3-000-rpm.758504/#post-5785028

Your symptoms of back fire and cutting out is a lean condition. The motor is not getting enough fuel, and it's not the coil. Is the problem with the original port motor?