So I installed a new clutch, motor mounts and threw on some longtube headers and a catless hpipe while i was in there. the car ran fine before the longtubes, but after, ive got lean pops during closed loop operation but it goes away during moderate and heavy throttle.
the car is all stock from throttle body to oil pan, only mods are smog delete, pulleys and blocked egr valve.
so far ive checked for vacuum leaks and found nothing, triple checked my plug wires and all is good.
things i havent checked are timing and fuel pressure as i dont have those tools at my disposal yet.
I was curious if anyone has had issues like this after longtube install. im thinking non foulers for the 02 sensors may help and will try that afterwork.