Poping or Misfiring Under Hard Accelearation

[jfuller5]

Does this happen on take off from a stop or will it do it when accelerating while already under motion? If it does it on take off what you explain sounds like the slip yoke on your driveshaft binding on the spline and then freeing up, that gives you the kick in the but that feels like something hitting the tailgate. Pull the driveshaft and feel inside the slip yoke, is it rusty? If is feels real sharp on edges of spline it may be worn and binding causing wiindup in drive line tahe it lets loose and bangs. T see if this is the issue pack the spline with a good grease and reinstall shaft in truck and try it out. If it has a 2 piece driveshaft lube both splines. Good luck JF