Loss of power

I purchased a 1997 Air Nautique EFI a few months ago and it was running a little slow and using a little to much gas. It was even slower today it was taking way to long to pull up wake boarders probably a few hundred yards before it hit 20mph floored. It had been slow before like having to floor it to get someone up but this was worse. We did a compression check and they were all over a 100 most 120-125 one close to 105. Now its dying worse and wont plane out or get above 15mph. The boat idles fine and shifts from neutral to reverse fine. We are wondering if this could be transmission not grabbing? Fuel Injectors clogged or letting to much gas in. Timing? Computer? I ordered a new fuel filter so ill know that In a couple days.
I also took boat back out and was able to get it at about 50% power few hundred yards to plane out and top speed of 35mph. The RPM's are a little low and the engine doesn't sound like it is working to hard when you floor it just bogged down.

back fires? yup i also would suspect in the fuel delivery....low or high pressure pumps fuel filter,

Never backfires or sounds like gasping for fuel it runs pretty smooth just like if someone took the second half of the throtle away.

No perfect pass. Any chance of the throttle line getting slack anyways?

Good to eliminate it as a possibility. Perfect pass has a servo motor that overrides the hand throttle, without it there isn't much chance of throttle cable problems.

Agree on potential limp mode.

A couple more quick checks:

*Does this have a Fuel Control Cell (FCC)? If so, have you Chechen that little rubber fuel line inside?
http://www.nautiqueparts.com/images/products/detail/photo.14.JPG

*Have you checked the anti siphon/check valve (connects fuel line to fuel tank)?

*Old or bad gas?

Fixed: we changed fuel filter checked fuel pressure checked out fine..checking timing we noticed the light wasn't working on a few wires so we thought wires might be the problem...we pulled the spark plug wires off while running and no change on cylinders 1 2 and 7 number 7 the spark plug was bad and the spark was all over the place not in the cylinder this was with a new spark plug I had just put in so I changed it out.   number 1 and 2 we swaped plugs we ohmed the wires and even swaped wires they were fine..ended up looking at a firing diagram and somebody had swapped the wires of 1 and 2 cylinder. boat runs fine now. Had been running on 5-6 cylinders all summer and maybe even for the guy that owned it before me.

63 Skier wrote: Nice easy fix! Enjoying the power with it running the way it should?

Yes more power less gas. it was dumping gas in three cylinders without burning it plus with the boat not getting on plane its a 100% difference.