[Chris Stewart]

Find the Assembly Line Diagnostic Link (ALDL) at the lower portion of the dash to the right of the steering column...it's the connector for checking Trouble Codes. Maybe the computer "remembers" something to lead us to your problem.
Jumper the 2 top right holes with a piece of wire or even a paper clip then turn the keyswitch on. The Check Engine light should flash once then 2 times...1-2 or what's refered to as a condition code 12 which is the computer's way of letting you know it's now in diagnostic mode and is preparing to flash more lights in 2 digit sequences. It'll flash each one including the aforementioned code 12 three times. After it gets through, it'll flash the code 12 again letting you know it's played all the stored codes.