If you still have it after putting in the new plugs and wires try this. Spray clean the throttle body (I would recommend every 6-12 months). Check for any pending codes and erase.. You might see MAP, but that is usually triggered by MAF. Disconnect battery for 5 minutes.
Reconnect battery and blip throttle when you start it each time. This would always fix my first SRT-6 for another 6-12 months.