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My first best guess would be that you crossed a pair of plug wires, or maybe knocked a vacuume line off, to my (admitedly limited) knowledge there is nothing you could put in the crankcase that would cause the symptoms you described.. could be a bad plug wire as well... with the engine running take a pair if insulated pliers and pull them off one at a time, if you pull one and it runs worse it probably ok if you pull one and there is no change, thats probablly the one.
hope this helps
Bret
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rust free in west Texas
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