Hey guys, I need y’all’s help. I have a 2003 GT, mostly stock. Cold air and x pipe with flow masters. “ small exhaust leak driver side manifold.” I’ve been having a hard time trying to troubleshoot a intermittent misfire on cylinder 1&5. The car runs like a champ when I first drive it, but after 20 mins of running it starts to misfire. I already changed the intake manifold, coil packs, spark plugs, swapped injectors. EGR valve, one O2 sensor. Checked for vacuum leaks, and checked wiring. My buddy ran his scanner to monitor the cars vitals, and both the O2 sensors on the driver side are reading funky? Maybe causing the cylinders to misfire? I also greased up the coil packs and spark plugs with electronic lube stuff. What do y’all think? Also when the car is idling after it starts misfiring it has a extremely rough idle. Oh and I also replaced the crank sensor.