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Posting the actual P _ _ _ _ number will give members here a clearer picture to offer advice. BUT since you say a code for high purge flow rate, it's quite possible that the purge control solenoid on the engine is stuck open(and rather common on all GM older vehicles). Not an expensive part or hard to replace.
Stuck open acts as a vacuum leak and can cause some of your problems. Just getting a used vehicle, should have planned to do spark plugs and wires right off as these are 2 of the most overlooked maint. items of any car.
 
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