Problem: Engine stutters for a couple of seconds when I step on the gas, but ONLY when accelerating AFTER I was traveling along and allowed the engine to brake the truck. This is the case when I eventually come to a stop and also if I never fully stop. After the stuttering, it runs great even when under heavy load like traveling up a steep hill.
Here's the odd part: If I take it out of gear just BEFORE letting the engine slow the truck, and allow the RPM's to drop to idle, then put it in gear and accelerate...no stuttering!
It's as if something were loading with fuel when I let off on the gas pedal and allow the engine to brake, resulting in a too rich mix when I accelerate again.
I put in a new timing chain last year and the engine ran fine for several months.
Items replaced with no effect on stuttering: Spark plugs, ignition wires, distributor cap, rotor, PCV valve, air filter, fuel filter. I checked fairly rigorously for vacuum leaks.
Any Ideas? Thanks Tony