Car cranks, but will not start

My car cranks, but does not start, mainly in cold weather. The only current codes I have are: p450 and1130. It used to have in addition to this, codes p0335, p0300, and p0150. Here is a little history on what I have done recently. I changed intake manifold gaskets, spark plug gaskets, spark plugs, one ignition coil, bank 2 sensor 1 o2, starter, battery and vacuum lines. It had a really bad oil leak from intake manifold gaskets, so that is why I changed that. So all that, and again the only current codes are the p0420 and p1130. Now it takes many cranks and tries to start in the cold, and does like it wants to shut off at idle, but it keeps running. I just cannot seem to figure out what is wrong. I wonder if maybe the crank has an intermittent problem. Also, the rpm's should flutter a bit while trying to start right? Because it is not.