You need to perform a diagnostic to find out what is wrong. Possible causes are
1. Ignitor.
2. IGF or IGT open or short circuit from ignitor to ECM.
3. ECM.
For cylinder 3 misfiring, Have you checked the spark plugs, wires, distributor cap, compression and fuel injector?
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Tuesday, March 29th, 2011 AT 3:23 PM