Chevrolet Repair: 2000 Chavalier, fuel injector cleaner, vacuum line

Question
I have a 2000 Cavalier 2.2L that has logged the following code, P0300 Random/Multiple Cylinder Misfire Detected.
When it misfires it lights up the traction control icon and the radiator fan comes on...(for a short while)but it doesn't do this every time.

I tried fuel injector cleaner and changed spark plugs and both coils...wires are okay.

Any help would be great!

thanks

Answer
What mechanical work or ANY kind of work has been performed on the vehicle recently ?. As most problems that occur after a recent repair was made can be traced back to the area of where the repair was made as a vacuum line may have been knocked loose or a wire connection came loose, Look around in the area where work was performed.

If your getting a traction control light and the fan is coming on, You apparently have a loose ground and or shorted circuit somewhere as these items are totally unrelated to an engine misfire.

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