Hi all I have the above mentioned truck it is a 3/4 ton 4x4.
I have just changes the plugs and coil packs on it, but it will not fire. It does crank.

Any ideas. Have I missed something? Please advise if you can. Thanks.

 

Have you checked your connections? Electrical, fuel? Are there any codes (check engine light on?) Fuses? I would look at the ECM fuses, test them too because not all fuses show blown. Their locations are in the owners manual. If you don't have one, this link will get you to a downloadable version:

https://owner.ford.com/tools/account...003/Ford/F-150