NEED ADVICE. My STBD 454 crusader engine idles rough and boggs out after putting it into gear. I have growth in the fuel tank which has caused me to have to change my rear fuel filters on numerous occasions. This usually fixes the issue until the tank is low or the ocean is rough mixing all of the sediment up and into the fuel line. This time, I changed them out but the STBD engine will not run for more than 5 minutes. I poured gas into the throttle body and it fired up and ran for maybe 10 minutes the first time but as soon as it goes into gear.. dead. On another note (maybe no correlation) i have a belt screeching when I try to rev the motor in neutral to get the RPMs up (the RPMs dont rise above 1100 no matter how much throttle is given. Seems like starvation. Does checking the internal filters make sense? Checking for any obstruction in the fuel line? Could it be an injection issue through the throttle body's electrical issue? Could we have a cylinder misfire? Thank you!