Lack of carb/tuning exp talking

[KiltedBanshees93GT]

*edit to previous post: The car does have a vacum lead off the back of the manifold, but its tied to the brake booster.

I'm starting to wonder if the problem really lies with the carb or maybe something else. I added a while new spark system over the last week or so, new ignitor, coil, cap/rotor, plugs, and wires. The car ran great for about a day and a half, and is now back to stumbling, stuttering and new to the mix, slight backfiring.

With the car in P, the idle will be at about 1500, with "twitches"upward of about 100 rpm according to the tach, several to a second. These are accompanied by a popping in the exaust up near the engine, almost like a baby backfire.

As you try to accelerate, the car is stumbling badly until the rpm get up to about 2k-3k, then it seems to smooth out. Same with slowing down, once the RPM gets low, the car starts to bog and stumble again.Also, up to about 3k, there seems to be a reedy quality to the way its running, with surges and weak spots.
When I pulled the plugs this weekend, there was oil on the threads of 1 or 2 plugs. I'm starting to wonder if I should dig out the gauge and check the compression.
I dont know if this could be maybe a combination of things or what, but any help is appreciated.

J

*addendum* The g/f just informed me that while driving the car (10 minutes ago), the car got up to about 50-55, and she heard a small pop, and the car blew a large black cloud out of the tailpipe. Running rich? Like I said previously, there was a bit of carbon on the plugs, but it wasnt a heavy crust. At this point I dont know which way to jump with this...