I forgot to mention this in my previous post:

When the engine is cold and I accelerate from a stop, the car begins moving and then quickly hesitates transferring power to the wheels for only a second or two before it catches and acceleration continues. So to explain differently, I push the gas and begin moving, RPMs continue to get higher but car does not accelerate for a brief moment, then if feels like something catches and power is restored to the wheels.

This only happens with a cold engine and only in first gear at about 5mph.

Any ideas? Thanks for looking!