On acceleration lately my truck has been running fine utill about 1500rpm, where it will stumble for a couple seconds, then continue to accelerate like normal. Air filter only has a few thousand miles on it, and I replaced the pcv valve a few months ago... Could it be fuel filter related?

 

Could be - I would suspect the MAF or IAC , Clean them both. If No change , then your throttle body ports to the EGR are prolly plugged. Also check for vac leaks - hissing sounds usually..

 

My old '93 did had that issue, but with the 300 motor. Never did totally clear it up, but a leaky vac line was a main cause. Don't remember exactly where, but if you had the hood up and motor running, then had a helper turn off the motor you could pretty easily pinpoint the leak, since the vacuum takes a while to fade. Did a mickey-mouse fix(I was selling it in a month or so and didn't want to waste time/money on the problem) That quick fix definetly helped.

A piece of rubber hose used as a "stethoscope" can help. Stick one end in your ear, and move the other end near hoses and connections.

 

My grand father used a screw driver for a stethoscope - Back then I had no idea what the hell he was doing - thought he was loosing it at the time . I still don't know how he did it like that - I tried sticking it my ear while the opposite end was on the motor and all I heard was the ocean

Oh well , guess I'm not as gifted ..

Anyway - the most common vac leaker in these motors is the line that runs from the PCV valve and disappears behind the motor ..

It plugs into the manifold behind the IAC , it's just hard to see . Your going to have to reach back there while its running and move that line around - listen for a change in the way she's idling while moving it..

Heres a pic of it - that 90 degree elbow back by the firewall is where it gives out and leaks ..