The ecu is located behind the passenger kick panel , there is a little window at the top of it which has 2 lights in it red and green, turn the key to the on position, do not start engine, push gas pedal all the way down then release, the lights will start blinking, for example if you get 3 green blinks and 2 red blinks that means code 32, 5 green and 1 red code 51, there is a list on the front of the ecu that tells you what each code means
SOURCE: 1992 pontiac grand am no acceleration, a rough idle (engine miss)
Does it have the 2.3l Quad 4 engine? If so replace the plastic piece that the coils go into, they go bad and leak spark to the cam towers and then you get a nice one or multiple cylinder misfire.
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