No kidding about the nickel and diming part.
Your mechanic buddy is half right. There is a filter on the fuel pump (which is in the tank), but there should also be another, bigger one down stream somewhere (probably mounted to the firewall).
Have you checked all the timing? If the ignition or crank timing is off, that will mess up low RPM load and cause the stumble you are talking about. Double check the plugs again to see if there is any unusual wear and also to double check the gap. Next, check out the relays. After that, I'm out of ideas.
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Project Sil-E: The New Black

In morning they will come alone
And we arise as if a new day's dawned for everyone
But now we know
As much as we don't show
OUR WORLD HAS BEEN BLACKENED!
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