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Why is service engine light on after driving up the hill?

(1999 Pontiac Grand Am)
in Tulsa, OK on December 24, 2014
I added fuel then drove up a steep hill, at the top of the hill the car jerked briefly & service engine light flashed for couple seconds and then just sstays on. Car seems to have no driving issue. I replaced new cap, no success.
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Popular Answer
on December 24, 2014
Sounds like a slight engine misfire and the light came on. I would take the car to a shop and have the computer fault codes scanned.
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on December 25, 2014
Auto Zone pulled code P0300 and P0463, added Lucas upper cylinder lubricant and injector cleaner, drove so far 25 miles, no success.
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