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I would suspect leaking fuel injectors, or a bad ECU. There may be a computer problem or an injector is constantly grounded which causes it to stay open. There are two wires to each injector, one is a constant 12volts and the other one is switched off/on through a ground path by the computer, check which one is the 12V wire with a test light then check to see if the other wire is grounded to the body or engine, with the key off and the engine off there should be no continuity to ground, if there is, disconnect the connectors from the computer and see if the ground goes away, if so, the problem is in the ECU, if it's still grounded start checking the wire harness, the wire is shorted to ground someplace. You can also check injector signal with a special small test light that plugs into the connector(available at most auto parts store)then when cranking the engine the test light should flash, if not there are the above mentioned possibilities, good luck with this.
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