Is this a tuning issue? Options

[bccentaur3]

I've had my car tuned twice and will get it tuned a 3rd time when I come around to getting the water injection kit. Well since the tune, I'll be cruising like normal and the car jerks. My rpms don't drop or anything, but the car just jerks. Is this caused by the spark plugs at all? Could this be an electrical issue?
O yeah, I get a lot of back fire too. Everytime I down shift and sometimes when I slow down in gear. Now what is this caused by?

[lagos]

cause when mine bogs I see my wideband go way lean (too lean to register a number) like it does during decelleration.

Thats normal. All cars cut fuel to basically nothing when you let off the gas.

Safc is just not a good way to tune for bigger injectors. It tries to fool the ecu to think that its seeing more/less air, but at the end of the day, the ecu is still going to do what it wants to. You also only have a very basic low/high throttle map and nothing in between.