engine light is on and no power to odb2 plug.

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the engine light is on and flashes after short drive and continues to flash until vehicle is shutoff or it dies. when motor is running sounds like its misfiring and there is a motor tick present. checked coils replaced plug wires and plugs... problem is still there. since there is no power to the obd2 plug cannot hook up to code reader to find any thrown codes. motor doesnt leak anything and oil is clean. used screwdriver on heads and parts of motor to listen for any abnormalities in motor and heard nothing. help!!! at a loss here for trouble shooting.