Guys -

I could use some thoughts from the collective on this problem I am having.

On hard acceleration from low RPM, I get a lot of stumbling and backfiring until the car gets to about 3K RPM. If I go easy on the throttle until 3K, there is noticibly less roughness (but still there). After 3K the car accelerates smoothly with maybe a bit of sluggishness. My LM1 shows AFR in the 17-18:1 area until 3K, then it goes rich at around 13.5:1, and gradually gets richer until about 12:1 at 6K.

I would really, really like to get the acceleration issue smoothed out, but don't know where to start.

Car specs are:
2.4 T bottom end (case,crank,rods)
2.2S top end (pistons, heads, cams, and MFI)
2.4 dizzy converted to mechanical advance
2in-2out muffler

If anyone can provide some insight, I would greatly appreciate it.

Thanks,

Kevin