Engine sputters when apply full throttle, then wrench light comes on?

This sounds like a typical engine misfire I would do a full tune up and replace all of the spark plugs here is a video to show you how.

Spark Plug Type

Spark Plug .................... AGSF-34N

https://youtu.be/E6oier7agkY

If you just want to find the cylinder that is misfiring, you can scan the computer and it will tell you which one is having a problem.

You can get a code scanner from Amazon for about $20.00.

Here is a guide/video to show you how:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Here is a scanner link:

https://amzn.to/3Qi1SS6

Also, you should service the throttle bore as well.

https://www.2carpros.com/articles/throttle-actuator-service

and

https://youtu.be/6fWYjfU9UV8

Please let us know what happens.

Replaced all coil packs, new sparks plugs (Motorcraft). replaced motor 2k miles ago (crate motor) etc.

Nice work, so we had a problem with a truck like this and it turned out the spark plugs were counterfeit ones from China. I would recheck the spark plugs for cracks and to make sure they are genuine motor craft plugs, if you got them from Amazon, they are probably fake. Here is a video:

https://youtu.be/OpDJNDb6b9A

Spark Plug .................... AGSF-34N

Let me know.

I've seen that video before, lol. thanks. You are right. I bought eBay Motorcraft spark plugs, but I found a loose pigtail connection on a coil pack on piston 3 bank 1.

I replaced pig tail. Engine slightly vibrates. I will be changing sparkplug to original. Can you please help me get a fuel pump sending unit diagram? There's 4 plug pin. I have 2 grounds and 2 powers. One gets 12v and the other one gets 7v.

Okay, here are the fuel pump wiring diagrams but they are included in the engine wiring, so I have to get you the complete set. You can save this post in your favorites, so you have them for reference later on if needed.

Thank you very much for your help. My truck is running better. It has a check engine light on. drives great at low RPMs, when I gas it on first or second gear it chugs. I will pull out codes once the system cycles. thanks again

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