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Raw gas smell may be the culprit of starting noise. Leaky injector(s) could be causing some fuel to enter chambers as you shut off engine, washing oil off cylinder walls and diluting oil. Check fuel pressure key on/engine off and test for gas in the oil.
this usually indicates an emission problem that could cause motor or catalytic damage.you need to go to the shop and have code pulled from the computer to start diagnosing,the cat could be plugged up as you say when you try to accelerate the car won`t move normally,the gas smell indicates the motor is not burning fuel as designed and the white smoke indicates a possible coolant leak into the combustion chamber and being burnt.this car needs to be checked out at a shop before major damage occurs if it hasn`t already happened.
The OBD II code for P0400 is Exhaust Gas Recirculation Flow Malfunction.
I'm sure the only thing you have left is you may have to replace the EGR valve or check for any leak from the vaccum lines going to to EGR valve.
could be the fuel pump listen near the gas tank while some one turns the key on you should hear it run. or the fuel pressure regulator must be checked with a fuel pressure gage, it could also be your computer is not telling the injectors to dump fuel into the engine. This can be checked with noid lights that plug into the wiring harness for the injectors and blink every time there is a pulse.
The gas in the oil thing can only be fuel injector related.I would start by useing a good fuel injector cleaner(recomend BG 44k)and see if that helps.On the emission code I would start by replaceing the gas cap.Its pretty common.