I have a 1973 mustang mach 1 with the 302 (originally a 2 barrel) now a edelbrock 4 Barrel. It ran perfectly when I bought it straight out of storage a couple months ago, recently it began to act up when I would drive it in the city, it would heat up to around 200 at stoplights and upon acceleration it lacks power and when you try to accelerate harder to compensate it starts to pop and backfire and still has no power, it never dies but it does idle roughly when this happens. Once you get it up to speed it runs fine and cools back down to a normal temperature of around 190. Once you get it out on to the highway for a bit it will run perfectly fine from stop right through full on acceleration again. Yesterday I went out to start it after it had sat a few days and it took a lot of tries to get it going because it would fire but then immediately die especially if you touched the gas, i eventually got it running but it was idling at a very low rpm and very roughly although it never died again and i left it idling for nearly 20 minutes probably, it was completely warmed up when i shut it off. Any ideas on what could be the problem? I haven't even really looked at it yet. Thinking it probably desperately needs a tune up or perhaps the choke is not working properly?