2006 Nissan Altima misfire after new plug and coil

nissan
altima

#1

I have a miss fire in spark plug #1 I have changed the plug and coil and I still have a miss fire???


#2

Run a compression check of all the cylinders. You may find #1 is low.


#3

A dirty/defective fuel injector can also cause a misfire.

Tester