Turn car off, turn it on, extreme shaking.

I have no check engine lights.

Example: You're driving pretty hard through the city but not racing, you stop and park at Vons to grab a drink, it takes about 5min. You get back in the car, start it up and you slowly leave and the car starts shaking like it's going to blow up internally, but if I give it gas it will generally go away. This problem has never stalled or stopped my car, it's just given extreme discomfort and worry on what's wrong in my engine.

For some reason my car likes going down hills, when it goes up a hill it will start doing this shaking thing if I give it too much gas.

Quick Parts History (5< miles)
FCAB's
Fuel Pump/Fuel Filter
Cooling System Overhaul (E46 Mango'd)
OFHG, VCG
Air Filter
ICV Cleaned, TB Cleaned
Spark Plugs/Boots
Slotted/Drilled Centric Rotors/Brakes
Both Pre-o2 Sensors
All Air Boots Replaced

I have an engine mount/tranmission mount/rear differential bushing waiting to be installed.

Any thoughts would be SO helpful.