NEED HELP Funny startup.

[Rizzoj2000]

I have an 05 TB with 115000 miles. It's a 4.2 6 cyl. Sometimes when starting (cold or warmed up) it spins through its cycle and does not fire. If I spin it again it still won't start. I have to turn the key off and then it will start. Any ideas.

 

[djthumper]

I would start with troubleshooting the ignition system. You can take the ignition switch out and test it or just replace since they have a high failure rate.