I have a 1993 4.3lx liter engine with 144 hours on it. The problem just started about a month ago. The boat use to go onto plane very fast. Now it takes forever. I have also noted a drop in rpm's, Used to be 5500 now 4200. I've done a compession test and they all read around 185 psi. I have installed a new coil(accel), new cap, rotor,wires,plugs and new 4 bbl carb. But none of these helped. <br />Looking for idea's and sugestions.