First of all is the service engine soon light on. The car should at some point detect the issue with the trans and throw a code.
The car running rich could be anything. Leaking injector, bad sensor, FPR, cylinders not firing or o2 sensors. White smoke usually means one thing, head gasket, which could explain a few cylinders not firing and hence it smelling like gas. How is the performance, is it sluggish.
Have you tried turning the traction control back on
There could be alot of problems with the TC.
First thing you need to do is get the computer scanned. A mechanic will do this for a charge.
My only recommendation is to find out what the problem is with the engine because that is the real money in these cars, if that has major problems then...well you know.
Good luck.