Not sure if you have autoparts stores here like we do, but ours will let us use their code reader for free. A blinking SES light means that you're having misfire problems and that your engine is spraying too much fuel, definately more than the sparkplugs can handle. The best and only way to fix this is to read the codes. Also, give the engine bay a really good looking over...pull and reconnect every sensor you can see to check for a good connection, check all the rubber lines you can see to check for vacuum leaks, check the intake boot for tears...just look around for anything obvious. Report back when you've got codes, that's all you can really do.

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