A number one misfire means that the number one cylinder is no longer working as good as it should or is not working at all. The number one cylinder is on the back side of the engine on the passenger side. 1-3-5 are the three cylinders in the back.
Three basic things can cause a misfire.
1. a bad spark plug wire
2. a bad spark plug.
3. a bad injector.
Remove the sparks plug wire from the spark plug and remove the spark plug. Inspect the inside of the wire and the outside of the plug to see if there is any carbon tracking. it will look like black lightning bolts. If there is any carbon tracking replace the plugs and wires.
Check the spark plug gap. It should be around .060". if its over .080" the plug is worn out.
Check for spark with a spark tester.
the fuel injector is a little trickier.
Start with the things above and let me know what you find and we'll go from there.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
Im having the same problem with my 2003 impala 3.4 liter, did U ever figure out what the problem was with Ur car?
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