2001 GMC 2500HD 6.0 5 speed 4x4

[Arthur1225]

Engine is bogging down on acceleration but if you ease in to it  it will go but you mash it to the floor it falls on its face.  Please help  lol

[KyRidgeRunner]

I had very similar problem with my 06 turned out had a leaking down pipe, replaced both down pipes, runs fine. I have been told this is especially normal and trucks with EGR delete and using block off place increases the flexing of down pipe, along with stress because of removal of the support (EGR) non EGR down tubes are available. Check for signs of high heat on your fire wall (insulation melting).

[carkhz316]

Is your Check Engine Light illuminated or have you scanned for any codes? How does the engine run when you rev it in neutral?