ok i got a misfire on the number 2.
i have a 2002 chevy trailblazer 131k miles on it

what i have done so far.
changed plugs
changes coil pack
changed fuel filter
also put a thing of injector cleaner in the tank.

what else could it be?
i get hesitation and knocking and rough idle.

 

please help me out. i dont have alot of money so cant take it to a mechanic to get the work done.

 

getting any codes?

Have you tried a throttle body cleaning?