Recently I installed a flex fuel kit and longtube headers (no cats). The car was running fine up after this mods. Last week I installed a ported MSD IM and it was running fine for a few days.
Today I went on a cruise and everything was fine. As I was driving home the car started idling rough on a stop. It sounds as if it had an aftermarket camshaft.
What do you guys think it could be? Can the MSD cause this?
Here is a video.
https://youtu.be/1UrDNKr2u1A