Hesitation-Bogging from 1,000 to 2,000 RPM

[marsh9man 0]

Thanks in advance for any help!

2004 centurion elite 350 with 800 hours that I've had for 15 years.

Boat starts and idles fine, but bogs down when I accelerate until about 2,000 RPM's and then jumps up to acceleration. It will sometimes stall if I return to idle, but start again fine. I can hear a pump prime when I turn the key.

End of season last year it was idling erratically and a little high and stalling when returning to idle from acceleration with an occasional surge when cruising. Since then I have:

New cap and rotor

New fuel filters (both)

Drained old gas and replaced with new gas and sea foam.

New IA muffler and IAC valve.

 

Wondering if maybe it's a pump or sensor issue?

Any suggestions for further troubleshooting?

 

 

 

[marsh9man 0]

Just wanted to follow up in case this helps someone else.

After also replacing plugs, wires and MAP sensor, I finally fixed the problem by replacing the Throttle Position Sensor.