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...94 Cobra, 150k. Nearly stock driveline.

After adding some Lucas fuel additive 3 weeks ago, car started backfiring through intake. Never has this happened before.

Changed spark plugs, and got some new fuel. Issue even worse now.
When car is cold, idles/ runs stong. Once at operating temp, car backfires everytime I hit 2k RMP. After engine is hot, hesitates to start up again, and lopes at idele. Battery voltage jumping around a little as well. Faily strong smell of raw fuel under the hood also.
I've had problems with the Evap canister hoses in the past, does this sound like a vacum leak?
Any ideas welcome. Thanks in advance!
 

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Best idea you're going to get at this point is check the codes.
 
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