Hey my truck is an 03 4.3 with 22k miles, this just started the other day i noticed, when i accelerate when it gets to 1700 rpm it will sputter/ sound like its missing, and when i drive at a constant 1700 rpm to 2000 rpm it will sputter/ miss not before and not after. it also doe this in N an park in that RPM range only, any idea im totally lost on this, mike