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Before condemning the PCM it would be a good idea to hook up a scan tool an see if the PCM is communicating an check for codes . Could have a burnt out bulb . Plus if the crank sensor was bad it wouldn't have spark or fuel . You could check power and grounds for the PCM ,do you have and know how to use a volt meter ? PCM power and ground testing avi
Plus check EFI relay ! http://www.bbbind.com/free_tsb.html free wiring diagrams . Enter vehicle info. year , make , model an engine size . Under system click on engine then under subsystem click fuel controls . Testing the electrical circuits using a wiring diagram to find spots to test at .
Before attempting to start it, unplug and clean any electrical connectors that were under water. change the diff fluid in both diffs, transfer case lube, trans oil and engine oil. Seals on most are canted inward to prevent oil from escaping but aren't really good at keeping water out when submerged. You may not have any water in any of those items, but its far cheaper to do the oil changes than to replace any one of those.
To start with if engine was blowing blue smoke then the rings needed replacing ,but if not blowing blue the rings dident need doing /uless the top ring had broken and that would have blown oil out of the gaskets and seals /Called crank case compression)
and if no oil leaks then you must have had a seal leak OR burning oil but you must have seen it the blue smoke???The head should not be your problem
Never heard of your vehicle.. However, Go to http://www.hmaservice.com/ and register (vehicle by VIN). Afterward, you'll have access to technical information (manuals, wiring diagrams, service bulletins, etc) about your vehicle.