Backfiring through carb. Wont start

[chief_shotts]

This morning i go to start my truck and it turns over but wont start. After a couple tries it backfires through the carb (Holley sniper efi). A couple small flames i promptly put out with a rag. Ive never experienced this particular problem. Does anyone have any suggestions.

Also want to note that i pulled a few plugs and they were soaked with fuel.

Engine is a 383 sbc with holley sniper efi 1.

 

[warrpath4x4]

I dont have any experience with a Holley sniper but, could your distributor be loose? I would think backfiring would be timing.

 

[Vbb199]

Theres a high chance your o2 sensor could be bad (they go out eventually) or you had an exhaust leak that eventually killed it
Whats the AFR when cranking ?

 

[Vbb199]

Or your fuel filters clogged, or an injector could be unplugged (all common)

 

[Ricko1966]

I'm thinking it's an ignition problem.

 

[Vbb199]

The gas soaked plugs is why i was wondering about an o2 sensor or a leak around it , much more than that, yeah probably the distributor moved or is acting up.

 

[Ricko1966]

Take an old spark plug open the gap wayyyy!!! up. Clamp the plug body in a jumper cable, other end of cable to ground. Put the plug where you can see it hook up a plug wire and crank. Tell us what you get for spark,is it consistent,blue and strong? .035 isn't going to cut it,it's firing in open air,with no compression and no fuel so use a big gap.