Hi everyone, I'm new to the forums but have been reading them for a while. i have an 03 silverado 1500 quadrasteer 4x4 with a 5.3 cold air intake, stainless shortys, 40 series, bullydog gt tuner, and level kit. all new fluids new trans filter. I've had the truck for about a year now and on a warm day with the ac on the truck is extremely sluggish off the line and not much faster with the ac off. when i got the truck it was completely stock. the mods helped a bit but its still way too sluggish. it feels like its starting off a gear or two high but its definately still in 1st. ive flushed injectors twice, ive cleaned maf. ive vhanged plugs (which helped more than anything) i run super unleaded with the tuner set to 95 octane. ive done everything ive seen on this forum short of twins or a 7.0 swap. the only code that pops is a knock sensor code which hasnt popped in the better part of 2 months. it was popping a misfire code in the second cylinder. havent seen that one in 6 months. anyone have any suggestions?