Running like crapola.

[dark horse]

Hey! My car has been running like crap for a while now. Here's what it is doing: It takes a while and a really bad sound to start up. When it starts up it sounds ok but its revving really weird. The best way I can describe it is this "vroom-vroom-vroom- vroooooommmmmmmm-vroom-vroom" sorry, couldnt think of any other way. OK. When I put it in gear, aside from almost dying, when I hit the gas it goes like this "vro-POP POP POP vroom POP" and sometimes stalls. It only goes on idle when ever I hit the gas, that poppin crap happens. Outta time? Running too rich or lean? Whats the deal? HELP! Thanks.
Jared

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1968 Mustang Coupe.
289 2v. c-4 automatic
Dual exhaust and full legth headers with glasspacks.