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start by checking for codes with a device capable of reading manufacturer specific codes.
depending on what you find there, you'll want to view vital parameters. ie, ficm voltage, ficm sync, icp.
when you cycle the key on, do you hear the hfcm operating? located under the drivers side door, at the frame rail.
you can also remove the secondary fuel filter at the top of the engine, remove the ficm relay, and crank the engine. if you see air bubbles back feeding through the fuel ports, there is combustion gas entering the fuel system through either a stuck open injector, or a leaking injector sealing washer
the richest ones are not those who have the most, but those who need the least
**i don't use capitals. deal with it**