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May just be a bad temperature sending unit. Once warmed up, it's supposed to go off cold start, which puts more fuel to the engine. If sending unit is not telling the computer the engine is warm, it will still be putting more fuel into the engine and flooding it, making it hard to start. Check/replace said sending unit and you're good.
The fluid is more thick in colder temp. thicker also means lowe level. Check your fluid level in hte cold. Could even be the input shaft bearing howling as well. Does sound match speed or engine speed?
see if your engine has a ECT sensor (temp sensor that delivers information to your ECM) they are installed on the intake side of the cylinder head, it usually has 2 cables, have it checked replace if necesary
I read the other two solutions top your problem and I have to say, some people should not give advice, because the advice they are giving is not worth anything. NOW, let me tell you what is wrong with your car. You have a defective IAC (Idle Air Control) value. The IAC value (sometimes called a cold start value) is used as a means to quickly start your car when it is cold outside. Replace the IAC (easy to do) and your problem will be solved..
without seeing where you are taling about im guessing it to be noise from air going past the idle ait solenoid at the throttle body, since it will be open farther when cold. if that doesnt make sense, try explaining hte noise a little better. i really dont think its anything to worry abotu if it only does it when cold.
could be a cold start issue. there is a water temp sensor near the thermostat. when you start your engine first for the day it will show the engine to be cold and therefore the computer will do a 'cold start', meaning using more fuel. but this should throw a computer code. if you are not getting any codes from the computer then check for a vacuum leak. like the EGR vacuum line for starters. the egr should be closed when the engine is cold and open as the engine warms up.