spankzilla, have you tried disconnecting the MAP vacuum line while running, it should go pig rich and/or quit in it's tracks. Disconnecting the entire harness isn't doing much for me since grounds go through that too, it'd be better if you could pull that wire out of the connector.
Sorry those guys are being so cold, I'd hook up my scanner if you came by our shop. I've never connected it to a sportjet before, don't know if it would even work. Yeah, if those guys don't crawl in bilges to work on mercruisers, then how do they do it? It's just an outboard sitting there instead of a V8, LOL.
That was just cold as hell though, maybe you should go schmoose the owner. Most likely needs to be a Mercury dealer b/c those are the only guys likely to have the scanner for Mercruisers and EFI outboards. Like I said, I don't even know if ours would speak outboard but I'd try it out of curiosity if nothing else, those do come through here occasionally sitting on the back of bass boats. Mostly this is Yamaha outboard city here and the occasional evinrude e-tec along with the older carbed outboards that just won't die (till a carb gets plugged and the owner runs it anyway).
Let's see if [MENTION=16022]Dr Honda[/MENTION] can throw his $0.02 in on this, he owns one you know.....
