RE: P0306 codes
 

I installed the ARK Cat Back SS exhaust system and also the STILLEN Gen3 intake system.
I had to reload the ECU after installing the Stillen G3 as the motor would not rev up. After reloading everything seemed to function just fine.
Lately, the engine warning light is coming on. I am getting a P0306 code - #6 cylinder misfire. Earlier I was getting a P0300 code which just said it was a misfire.
When the engine warning light is on the engine idle increases to about 1100 rpm.
After erasing the code the engine returns to app. 650-700 rpm.

Any ideas?

Thx

Well you came to the right place, however you may have already answered your own question. I would get the car tuned asap

The car only has 22,000 kilometres.
This code issue only started when installing the Ark and Stillens.
I will remove the coil packs and spark plugs to check out.
I have never had any luck or satisfaction taking my cars in for any services like a lot of people I know. If they can't find the problem they call it 'normal'.

check your flange from the headers to the test pipes.

had this issue, found the flange not completely seated, causing unmetered air to hit the Oxy sensor.

Thanks, I'll do that . It's time check the torque on all fasteners also.