So for the last couple of months my car has been acting up a little. It almost sounds like it is misfiring. Basically if im in 4th gear or so and my RPMS are anywhere at all and I step on it, I get a hesitation and almost like a small pop pop pop or kinda bump sound. I noticed my A/F gauge acting way way weird. Im not sure if its a plug or something else but I dont know where to look.