94 firebird is running sluggish and makes popping noise in

[jennwtx]

all gears? We have replaced 2 o2 sensors and the spark plugs and didn't help. It runs really sluggish(boggs down) and pops 1 or more times in each gear....it sounds like a backfire but, in the front of the car....has like a gurgling noise to it when reved up. Please help!!!

 

[Will S]

It could be the timing chain. I would suggest taking it to a reputable repair facility before throwing any other parts at it, as this can be expensive just guessing at it.