Ok, the first problem is that around 1/2 a tank of gas the car stalls after hard right turns and at a hard stop. Is this the fuel pump? Cause after i replaced the catalytic convertor and fuel filter it was working fine for two weeks, then all of a sudden it happened again. Please help this is getting really annoying.
The second problem not sure if this happens to anyone else, but every once in a while it just won't start, I have power to everything so i know its not the battery, I turn the key and nothing it doesn't even kick. After about 5-10 minutes i turn the key and it starts right up like nothing ever happened. whats up with this Please help!

When it doesn't start, is your security light on? Clean the contacts on your key and in the ignition switch with alchohol and a qtip. Check all your battery connections at both ends of each cable. Loosen and re-tighten them. Consider a new key, as well.

The stalling in turns is the strainer assembly below your fuel pump. I suggest replacing the pump and strainer if you're going to drop the tank.

the sensor light doesn't come on and i already switched the key with my backup, the batter is connected fine, sometime when that happens i open the hood and move couple of wires around it starts up.

thanks for the tip on the gas tank i was fearing that i would have to dop it, by the way is this an easy thing to do?