Engine will not stay running

Let's start with the basics unless you have already changed a number of different parts.

However, if you have misfires then we need to start with checking the plugs, wires, and injectors.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

However, the fact that you just got this truck, and the exhaust is in poor condition, I would suggest with just changing all your ignition components, fuel filter, air filter and then recheck the operation of the engine.

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

https://www.2carpros.com/articles/how-to-change-a-fuel-filter

If none of this checks out, we are going to need to move onto a possible vacuum leak. So here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let's start with all this info and based on results we will have a better idea what the issue is but we will then need to check fuel pressure, but I don't think that is the issue which is why we need to start with all this.

Let us know what you find. Thanks

Great video. That helps a lot.

We need to jump straight to compression checking because I bet you have some bent valves that are no longer sealing, and you are going to be low on compression in more than one cylinder.

https://www.2carpros.com/articles/how-to-test-engine-compression

This engine has a timing chain so I doubt it jumped a tooth or slipped like a belt can. I think that the bang was pistons hitting valves and did some damage.

However, if the compression is ok then we can dig further but I bet that is going to tell us what is happening.

If I am correct, then unfortunately mudding may have claimed another engine.

Let us know what you find with this, and we can go from there. Thanks

No. A sticking valve is caused by carbon build up or not maintaining the vehicle properly among other things but not over revving the engine.

The red line and bang event most likely bent the valves. I understand it does not sound like it has no compression, but you are going to be down on compression and that is why you have such a bad misfire, and it backfires when you rev the engine.

We need to do a compression check and at this point and at least confirm they are ok. However, I am pretty confident that we are going to find the issue here. I hope I am wrong but everything you told me is pointing there. Which means we need to do a compression check.

Let us know what you find. Thanks

Haha. I am no different. I don't even like reading instructions. I want to figure it out myself and when I can't I get frustrated.

Thanks, is why we are here. If you need help, we are here for you. Let us know what you find.

Thanks