My 2002 mustang GT (manual, 60K miles, full bolt on with cam) has been running fine. It’s my only car, so it’s my daily. Last week I started it up to go to work and it started up just fine. I always let it idle for a few minutes to warm up, so that’s what I did. It idled fine for around 2 or 3 minutes, then I noticed the RPMs slowly started decreasing, from around 1000 rpm (it was a cold start) down slowly under 750 rpm ish (my normal idle). It then kind of violently started dropping and...

Car starts, idles, bogs down, and dies