Running an HOD event today at Pocono. First time on the track this year. Only changes I did to the motor this year was add a JLT CIA, Peterson catch can set up and AED tune. First two sessions the car ran strong with no issues. I let it sit two hours for the lunch break. When I started her up for the third session I noticed the it felt like the car had a miss with a very lumpy, erratic idle and then it stalled. It would start right up but immediately go into the rough idle and then stall. I was able to rev it enough to get it on the trailer and back into the garage. But with a 4 straight days of running coming up in three weeks including Watkins Glen, I am under the gun to get this resolved. Any ideas? Bad coil? I quickly checked the 2 vacuum caps I placed over the JLT intake tube but they seemed secure.