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Have you checked for spark or tried to start it with starting fluid?
It could be in failsafe but if this was the case your security light would be flashing....I'd also remove the oxygen sensors on manifold to see if that helps....If its a security problem do the following procedure:
Bump key in start position for a second then leave in on position for 10 minutes, off for 5 seconds, on for 10 minutes, off for 5 seconds, on for 10 minutes, then start.
So it seems to run good now? Does the check engine light ever flash? thanks.