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Check for correct fuel pressure. Connect pressure guage to schrader valve on fuel rail. Turn key to ON position without starting engine. Fuel pressure should be between 55 and 61 PSI. If it is too low, replace fuel pump in tank and fuel filter.
If you have a throttle body, then you most likely have to injectors inside the throttle body. Check to make sure that they are funtioning correctly. You can check by using a voltometer and testing the injectors' lead wires for an electric signal, there should be one. Also, check to make sure your fuel filter is not completely stopped up, it happens. Also, sometimes the fuel pump can turn, but not put out enough pressure to start the car. There is also a fuel pressure regulator on many late model vehicles that can malfunction. I would check that as well.
Bad TPS will give you a SES light. Possible low fuel pressure from bad fuel pump. Put a fuel pressure gauge on the service port close to the firewall, should stay above 50 psi when juicing the gas. Only use OEM parts on a Bravada! Try "thepartsladi" store on eBay.
If the relay is pulled, the fuel pump should not be running. If the mechanic is right, there is a short and your pump is getting electricity from somewhere it shouldn't. If that's not the case, the mechanic could be wrong. Post what the original problem was as a comment please.