So I've been experiencing the thing where the engine has to turn over a few times in order for the car to do a cold start. If I turn the key to the on position first and let the fuel pressure build, then the car starts right up. The entire time I thought that it was just my fuel pressure regulator, but today, I had my hand on my grill and the engine was rumbling off and on like there is a slight misfire or something. Could one of my fuel injectors be leaking/have a problem? I'm just due for an oil change, so the final thing would be if the oil smelled like gas. Does this sound like a possibility?