I talked to my dad, and he don't recall what kinda cap he bought (which means it was CHEAP).. I put a NAPA cap on my 4.3 about 10k or so ago and it has been fine.. But again, I know dad didn't buy a NAPA cap either.. My dad believes a NAPA store with a higher price than the "big box part stores" just want to rip you off.. Personally, I have had far better luck with NAPA parts than anything bought from Murray's/ O'Reilly's, Auto Zone, ETC..
We'll try the timing light on the plug wires, and that should help tell a little more on what is going on with the misfire. We were going to swap plug wires to see if that made a difference tonight, but was mom's birthday, so we went out to dinner.
I also think trying the carb cleaner in the oil cap sounds like a good idea as well.. I don't think it has a plastic intake, but did not pay that close attention.. I guess I never thought something like that would cause a miss, but it would affect the vacuum, which in turn affects other things..
Dad does not recall what the fuel trim was showing, so we will check that tomorrow and post back.. He's supposed to be the one that works the computer, but sometimes neither he nor I know what exactly to be looking at.
And Bryan, when it comes to info, I'd rather throw a whole bunch out there in hopes to get the issues resolved than get 100 responses telling us to do what we already looked into.
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