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I don’t think you can really knock these engines out of timing.
Are you sure spark plug leads are on the right plugs & coils?

yeah i looked up the correct firing order and made sure the leads were on the right coils and in order

Drivers side - 2/4/6
Passenger side - 1/3/5

I was talking to someone who started going on about the timing and saying you have probably knocked it a tooth or 2 out of timing and it has just gotten me thinking about it ever since.

Unless you’ve done a cam change and mucked it up or somehow fitted the harmonic balancer/toothed wheel incorrectly there’s not much else it can be unless the crank and/or cam sensor are faulty or a faulty DFI module.
Check coil end matches the plugs as per image here
https://www.gmforum.com/1992-1999-91/fi ... er-259745/
I’ve mucked up on a stock Ecotec before mixing up 2 leads as they run under the alternator.

Exactly what i was thinking, Thanks mate will go out and double check everything, Just noticed in that pic that my coil ( 2 & 5 ) sits where ( 6 & 3 ) sit in the pic

switched that coil around & checked all leads and are in the correct firing order but unfortunately still not starting

what would be causing it to backfire & spit flames out of the lower intake manifold ?

stuffed round with the coils and leads, Hit the key & bang she fired up this time, Thankyou to everyone who has helped along the way i really appreciate it

Good to hear that part is now sorted.

Thanks Mate

A bit late back to this thread, yes you dont need oseplugin on the flash pcm. At the time I was thinking we had a Memcal PCM with an NVRAM. That was a mistake on part - sorry! Im glad you got it figured out.