Alight I got a 05 evo 8 with a leaning out problem
and the mods I got are a MBC and upper ic pipe and lower my psi is at 19-22 don't really know haven't tuned my car and running stock plugs from Autozone and also stock coils don't know why my car is leaning out FYI my afr gauge suck it's eBay.

 

I understand you are probably typing this from your phone, but your question is almost unreadable as the grammar is horrid and jumbled together...

If you have a ****ty ebay gauge then how can you be sure you are running lean?

 

Get it tuned.

 

Yes sorry for the grammar and I am typing from my phone.
well long story short my gauges work fine there not the best quality gauges.

 

My car was running rich with the plus I have been using then out of the blue my car just started to run lean idk why.

 

Maybe your wideband is on its way out..

 

Get a tune for sure as stated above, use high quality gauges.

 

check or replace fuel pump and get it tuned

 

why are you running and MBC if you're not tuned? chances are you probably cranked it up and that's why the car is running lean

 

Could be a vacuum line that disconnected on the intake manifold, check around it to see if theres any unconnected lines...that caused my car to run lean under boost