1996 impala SS sputting

Question

My Impala is sputtering at low idle as if it wants to cut off. If i give it gas it hesitates then picks up rpm. Sometime a firecracker sound is made, i think one of the spark plugs is bad, but wanted to get a second, third or fourth opinion. I have changed the 02, crank position sensors and fuel filter. Just last month i changed the spark plugs, wires, wire harness and distributor, then drove it down to northcarolina from D.C.. just last week the car started acting up,

Answer 1

my answer is try to check it out first on auto repair shop maybe there other problem..