So my brand new gto had a funny thing happen. My. Rebuilt 400 with over 1,000 miles normally idles very nicely. It is rebuilt, headers, and a bit of a cam but can sit idling forever, and in gear at intersections no problem. But today I was cruising along at about 50 or so, and ahead of me traffic had stopped down a slight hill. I stopped rather quickly, but not unreasonably, when the car stalled - it actually stalled just as I was coming to a stop, and the car should have been changing to idle. I stopped, put into park, then it was a bear to restart. Eventually held my foot to the floor thinking it was flooded, and it did restart. Any ideas what would cause such a thing with a car that actually idles fine? I really don’t think I have a vacuum leak, and I haven’t been able to recreate this. Thoughts? Thanks!