Put the boat on water for my first time last weekend and when you push throtte the response is real slow. 3-5 seconds and then starts to pull. I was wondering what are the systoms of bad MAPP Sensor. Any ideas would be appreciated.

A bad MAP sensor should trigger an alarm. I'd get the motor scanned.

Is it breaking up as it accelerates?

No, it justs seeems to be delayed on powering up. In my area I have to go some distance to get to a scan tool also.

It would be money well spent to buy a scan tool or diacom software.

Thats what its looking like, too many sensors to guess at. Any suggestions on scan tool? I am looking at the Rinda basic but wondering how in-depth they read?

I use Diacom, I have a 525 now, and used it with a 496HO also.

I did check codes and have 3 active, they are 75,118,191. The wot rpm is also down. Starting to wonder if may intake vacum leak could cause this. I don't have a book to break down these codes, so if someone could help on this matter I appreciate it.

Could It be something as simple as too much prop pitch?