It's always best to start with the problem with the truck, not a question, yet, about troubleshooting.

As Kevin is indicating......do we have........
1. No fire
2. No start
3. No known spark
4. Backfire
5. Runs and dies
6. Stumbles on acceleration
7. History.1 When did it start doing what it's doing and did it ever run ok.
8. History.2 What have you done recently. Parts? "Fixed" something? Wiring? Tuning/timing? Ran it into the lake?
9. Other


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn