I have a new head ache. I am fairly certain this only happens when car is hot. I get really erratic low idle when engine is warm. Maybe its the o2 sensor? Or plugged egr or exhaust? I ordered a new o2 sensor for 16 bucks it will be here in a week. In the mean time I will run a compression test and fuel pressure test. Also will run the compression when the engine is hot on any suspect cylinders. Maybe head is going bad and not sealing after warm? So far no check engine lights have been tripped. Been this was for about a week and getting a bit worst.