Hey guys, my DD chevy 3/4 tons motor is running like ****. I went to fill up one day and since then it has been running like ass. It misses real bad, backfires from both the intake and exhaust only at take off. It is extremly sluggish and reaction time is horrible. It also does not want to idle and dies occasionally when driving. The idle also fluctuates from 500 all the way to 1500 rpms. I have changed everything that i could think of that might be causing this problem. I ran all the "bad" gas out of it, changed fuel filter, didnt change the fuel pump cuz it seems to be workin fine and only has 25,000 miles on it. I also changed sparkplugs/wires, O2 sensors, Tp sensor, ignition coil, and new cap and rotor. I am running out of ideas on what could be wrong. My check engine light is fully functional but has not come on. If yall could put in your 2 cents about what u think might be wrong i would greatly appreciate it cuz it has been runnin ****ty like this for a few days now. Fred any ideas? Thanks
Danny