Run through the tests, in Sections A and B, below:
http://www.askmehelpdesk.com/cars-tr...das-46563.html
If the Check Engine Light comes on and goes off, after two seconds, when the ignition switch is turned to ON, I would focus on testing/replacing the Ignition Control Module (ICM) and coil, which are inside the distributor. AutoZone can test these components for free. While you are at it, I would also replace the rotor, distributor cap, and spark plugs (NGK only). Here's how to replace the ICM and coil:
http://www.askmehelpdesk.com/cars-tr...tml#post265896