LQ4 Backfires, stumbles on light acceleration?

[Nodnarb76]

I have had my motor swapped into my Suburban for about 4 years now. Recently when the motor is warmed and I am giving it light acceleration, it will back fire, and stumble a bit. I do not have a check engine light on. When I did the swap 4 years ago, I installed new plugs, wires, and coils.
I am wondering if I should replace the plugs again, maybe the cam and crank sensors?