Long tube headers installed, now backfiring on deceleration?

[BabyBlueChevrolet]

So I finally got around to installing my long tube headers today. I removed the rest of the exhaust including muffler for now until i can find a place that can weld me on some mufflers. It runs fine (loud as hell) when i step on the gas, but as soon as i let off the throttle, it backfires like mad. It got so bad I had to put the truck in neutral when i got off the freeway, which seemed to eliminate the problem.

Is this because of the fact that im only running headers? It would backfire a bit while decelerating before but now its so much worse.

 

[PrairieDrifter]

That's open headers lol.. if you have backfires during decel with a full exhaust it's generally an exhaust leak or in the tune. Running rich.

 

[Radiohead]

Unburned fuel meets hot surface where oxygen is hanging around and you get the cackle bombs. That's why no boom boom in neutral, not a bunch of unburnt fuel flowing at idle.

Be sure the exhaust is sealed good. Blowing up mufflers gets spendy, and nerve wracking.

 

[Ricko1966]

Prairie drifter and Radiohead have given you good advice. Unburned fuel meets oxygen causing backfires.