I just bought my first mustang (1967) and on a cold start it runs great. Once you heat it up and shut it off then try to restart it as soon as you put it in gear it starts to stall out. If you let it sit running for a minute then put it in gear it does run but very ruff and it back fires and bogs out as you give it gas. Like I said though cold it runs great and doesn't over heat while driving in fact I just drove it 70 mph for almost 2 hrs on the freeway with no problems. If did seem to want to back fire a few times if I floored it but otherwise it ran great. Any ideas as stated it's a 1967 mustang
straight 6 single barrel carb.