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8.1L Horizon problems...please help

cadde300

New member
370 hp version of motors, inboards. Boat has 190 hours on it and starboard motor is acting up. replaced oil, filter, and fuel filter. Motor is running rough and will not smooth out with throttle. Will not hold idle very well under 900 rpms. Also oil pressure has dropped from mid 50psi at idle to high 30psi at idle. The boat is at the boatyard getting compression test now but have no idea what this could be. Also, any ideas on where to pick up a long block or short block without getting bent over the coals? All help is greatly appreciated. They are making it sound like I will need a new long block out of this but I can fathom that this is the case on a boat with under 200 hours and fresh water cooling. Could this be anything else?? Please help.
 
just got word that IAC is up around 100 to compensate for whatever is going on where it usually in the 30 range. Compression test is being done now.
 
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