Please help me find this bog...

Hey All:

I have a bog in my car I can't seem to tune out.

I leave off a transbrake and the thing goes, then bogs, then goes. Sometimes it turns the tires a bit when it picks up again.

I've tried less burnout, more tire pressure, two step adjustements, and adjusting the cal tracs and rear shocks. None of this made much of a difference if at all.

I'm starting to think its in the carburetor - because the one time the car has left "perfect" - I was at the tree and I ended up letting out of it because the tree wasn't coming down, then it did,so I just went back up on the gas (extra pump shot)and released as soon as the car came up to RPM. A buddy who was watching the car said, it spat out a bunch of black smoke, but left like he hadn't seen it before. This makes me think it might be leaning out when I release the button and it loads?

The carb is a 750 Quickfuel double pumper. It has a power valve in the front (8.5), and a plug in the back. I am running a wideband O2. Jetting is 73/77, which gets me around 13.00 at the top end of the track and about 14.00 on part throttle cruise. I typically leave the line at 3200 RPM.

Any ideas/help are appreciated.

Thanks,
Steve