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First, you are in the wrong forum.
Then a question, did you look at the vacuum lines, is the fuel pump working properly? Is the fuel filter clogged? Is there any blockage in the carb idle circuits? Water in the gas line?
The way to fix things is to eliminate all the variables. And look for the obvious things first. Your car has 250,000 miles, it could be coincidental.
Changing the oil shouldn't have any effect on the car idling, (unless they didn't put any oil back in).
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