backfires through throttle body

It sounds like the engine has lost timing like the timing chain has jumped. Here is a guide to help you check the timing chain.

Here is a guide and the timing chain diagram below so you can see whats going on.

https://www.2carpros.com/articles/engine-backfires-while-running

Check out the diagrams (Below). Please let us know what happens.

Cheers

Yep the timing chain was gone! I replaced it but the engine had bent valves so I junked it, thanks for your help though.

Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers