Did you adjust the valves as part of the PDI? They won't go out of adjustment in 50 miles....unless you under or over tightened one of the adjuster retaining nuts.
Sounds like fuel air mix is way off. Like KZ said, big air leak somewhere. Check clamps on both sides of carb
As far as the stalling at idle....turn up the idle speed screw...see if that helps. Once you get it to run on it's own, adjust the a/f mixture screw.
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