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You have a scan gauge, so put it to use.
Make sure that your engine is getting up to temp, 192F
Make sure that your engine is going in to closed loop.
Make sure that the rest of the info on the scan gauge looks correct.
After that, do a tune up on the car, transmission flush, spark plugs (compare them to each other), air cleaner, pcv valve, check your timing, check brakes and wheel bearings.
Is your new Geo a 3 or 4 cylinder engine? hatch back or sedan?
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