1995 carver 370 w/ crusader engine rpm issues

[bwilson]

I need help tracking down a problem. I have a '95 carver 370 acmy with crusader 454 XL EFI engines. As I brought the engine down to 1500 rpm the port engine began to vary in rpm...bouncing up and down from 800 rpm to 2000 rpm. The oil pressure gauge would bounce right along with the rpm's. can anyone tell me where to start in tracking down the cause of this problem. Thanks

[Viper]

Could be a number of things but start with the easy stuff first; when was the last time they had tune-ups, like changing caps, rotors, plugs? Pull the cap and check it. If the contacts are burnt, corroded, etc. replace them, the rotors and plugs and retest, then go from there. Fuel filters last replaced when?

[PCOMT]

I experienced a similar problem. After checking points plugs etc and all the electrical stuff, I found the problem to be a plugged fuel filter at the carb.

Replaced and all is well again

I have 3.8 liter crusaders.