Hey, im new here cause i am 16 and just got myself a 1978 Mustang Mach 1. I have a question though, i drove it home just fine and everything was running great and i drove it around town a bit and it was just fine and i was very happy with it. However my dad messed with the screw that adjusts how high the car idles, and now it seems to be sputtering and like dying while im driving in like first and second gear. Now im not a mechanic, (and i know from computer forums im in and stuff because im a computer technician that just like i would on a computer forum your going to talk very mechanical ha ha) however any help like telling me if that screw is the culpret or if it was something where it just stopped working or maybe a spark plus is dead would be AWESOME. Maybe this is an easy problem, maybe its not, but if anyone had any info i would VERY much appreciate it.