So recently there has been a slight backfire has appeared yesterday whenever the car is in idle while having the a/c on. When you start the car, it starts fine but when it's in idle you can feel a slight backfire within a minute or 2. Then if you turn on the a/c now and the compressor kicks in the slight bump kicks in a rapid pace with in 2 or 3 bumps per 15 seconds. Then when you turn it back the a/c back off the slight bumps drops to every 30 secs. I've scans the car there isn't any misfire recorded. I've read the book for the car and basically stuck at base 1. I'm thinking it have to be the ignition coils because the fuel injectors are working properly, and the spark plugs are good. When drving the car is a bit sluggish at a certain gear then it kicks in. I just don't want to go to the mechanic for something this simple.

 

Please scan for codes again.
If it's running poorly it should be throwing a code.

Also, are you sure it is backfiring?

 

Yes, it is you can feel a slight kick back. I've scan it over like 20 times with 2 different readers and nothing is popping up.

Update: I got it solved I've change cylinder 6 ignition coil, and it seems to solve it.