well guys i got this problem and have had it for a while when my truck shifts from 1-2 say at 20mph its got a lag and then it shifts hard and u can hear the engine sound take a loud step and say when i accelerate froma dead stop and slow rolling 75% and WOT throttle 2 it almost feels like the truck is lunging being held back i replaced plugs egr cleaned tb and pvc and my cai filter i reset my pcm also and still does it i know this is not normal it cannot be the truck for the mods i have seem slow i even took my tuner off set to stock and still does it the dealership told me to reset my pcm and try that for a bit this si really starting to annoy me can anyone help btw sorry for the long 1 sentance rant..

if so i can even take a vid clip with my camera so u can hear it shift and maybe here it lunging....

How does your trans fluid look? Is it full?

yea i checked it a few days ago and it was fine i bought the truck used and never had the trans fluid changed and the head mech i talked to said no need to 100k which seems fing steep

and another thing truck stalled today while i was ina drive threw ?????

and call me weird im still getting that buring tar smell i posted months ago about it to i punched my truck hard full Wot then i got the tar buring smell wtf is that