About a week ago my truck started to get a noticeable miss in it. 04 5.3 114,000 all stock original plugs and wires. It seems fine up to about 50 but between 50 and 60 it has a stutter in it. very noticable. I can feel it pretty good. If i just cruise between 50 and 60 and just give it a little gas it does it bad but if i accelerate through these speed to about 65 i don't notice it. It kinda felt like the trans slipping so i dropped it in to 3rd and it done the same thing. I also checked my trans fluid and it seems to be normal. Don't matter the rpm's just the speed. Next day or two i'm gonna change plugs and wires. It couldn't hurt anything. Help me out here. What do you guy's think?