So I had the idle issue and the car is coming back to the shop because of it running lean on my 2.4 ssna
Only thing I have done to it is full exhuast by zzp with midllength header with highflow cat cp
And a drop on k and n air filter
I just had the ecm flashed at a Chevy dealer and they said they couldn't figure out why its running lean...
Any ideas?

 

Did it start after any of the mods?

 

dodgy sensor (lambda) or damaged when changing or a exhaust leak

 

put the stock air filter back in. I'm sure upgrading the exhaust and a high flow cat is letting the engine breath a little better than in stock form. Could also be oil on the MAF sensor from the K&N

 

Ya so engine light came back on, idle is fixed now. Next thing to do is to replace my 02 sensor. I have a new tb and new maf sensor