[bubbazenetty]

It's probably running WAY lean instead of what you think it is running as rich. Popping and backfiring during decelleration is usually due to a Lean condition. Running lean will produce a much higher temperature in the combustion chamber, requiring the cooling system to work harder to keep the engine in it's optimal operating heat range. Try PM'ing Section8, and asking them if they can get you the correct chip for this application.