Car is idling funny when just sitting there and when i jump on it itll backfire at high rpms or redline? I was just driving and all of a sudden all of this started happening..i think it might be an air fuel problem

 

Do you have an engine light on? if so what is the code?

 

Did you fill it with 87?

 

no engine light and i use 91 octane

 

With no code it's kinda hard. I ve read alot of people with MAF issues on a open filter or k&n because of the exra debris and oil build up. Maybe check that.

 

i have a zeitronix AFR display and when the car is idling at a stop the afr is bouncing all over the place from the 12 to 18

 

Check the vacuum line going into your fuel pressure regulator, if you lift up your engine cover its at the bottom left hand corner, make sure thats on there good. I really doubt its due to your air filter, but MAF issue is definitely possible. Best thing to do would be call your tuner, tell him the issues that your having. It could be a number of things but most definitely something related to air/fuel, but I would check that vacuum line going to the fpr first, call tuner and go from there. My guess is, its something pretty easy to fix.

 

yup definitely was the vaccuum line, it was disconnected

 

zip tie that ****! lots of X owners have this problem too.