4.3 mpi

i just bought a 2006 Sundeck 200 with a 4.3 MPI engine. I put a new prop (14.25 and 17 degrees) on it. It has very little power out of the hole and takes a while to plane. It tops out at 4,100 RPMs and only 28 mph. The engine only has 153 hours on it. It is disappointing. Is there anything I...

I think I have a bad IAC on one of my 4.3 mpi's. Was idling along today when it died and then became hard to start. Runs good above about 1200 rpm. Can anyone direct me to instructions how to find it and replace on this engine; and where's a good place to order these kind of parts? Thanks!