Truck has 175K miles. It recently started having issues when I accelerate. On the highway it will run fine if I steadily build up speed, but when I have to accelerate to pass, it starts to act like it is missing. The tachometer shows the RPMs jumping/dropping after it reaches about 3K. I pulled the MAF and it looks clean. I am going to check the PCV tomorrow. Neither the MAF or the PCV has ever been changed. The distributor, wires, and plugs were changed about a year ago. I checked the distributor and it looks good. All wires and plugs look good also. I am the original owner, so I know of no other issues or recent problems. Also, had the codes checked. The only code is for the knock sensor that shows up from time to time over the years. I also let the gas tank go near to empty, filled the tank, and added a fuel additive, so I don't believe it was bad gas or water in the tank.
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