I know the 1fzfe is not exactly a speed demon, but i feel like she has lost a little power, after a tune up. About a month ago i replaced the spark plugs (denso iridium), spark plug wires, rotor and distributor cap with OEM from Cdan. I have M1 synthetic in the motor and diffs. Birfs have been serviced and greased with Amsoil. New belts and flushed the coolant. I checked the compression along the same time to find it within 2 psi across the board. After i replaced the plug wires and associated parts i really noticed an improved throttle response and more power. It was a seat-of-the-pants power increase because i never dynoed the truck. I did notice when replacing the wires that my spark plug seals may be leaking just a tad as there was slight amounts of oil on the plugs and wires as i removed the old ones. I just got back from a 500+ round trip to the beach. On the way there and back it felt like the cruiser just didn't have the power it once did. There is a commercial out now showing cars driving along towing an anchor, that's the best way i could describe it. There were several times on the highway at cruising speed of 65mph that if i wanted to accelerate to 70 to make a pass it would take me flooring the pedal and 15 miles or so to do it . It just felt like a slug the entire trip. I can't seem to figure it out. When i changed the parts it was like a new truck, now, only a month or two later it seems like it is back to how it was before i changed the parts out. Any suggestions?