Car got a delay cold start when the car sits for a moment but when the car as been driving for a while and u turn it off then try to start it again it starts in one click but after it sits for a while then try to starts it give a cold strart. and then when it starts the gas fume is real strong coming out the car. my car is a 2003 hyundai XG 300

This sound like it might be a transmission issue. If the revs are dropping as you are at idle something is 'Dragging' the revs down and the delay is the engine and transmission trying to catch up with each other. A test you could try is the next time the revs start to die drop it into Park and 'Blip' the gas pedal to get the revs up then put it into Drive to pull away.
You may need to take it to a Transmission Specialist to get them to look at it.

It's gathering frost inside. When you turn it off & drive around for a short while, it defrosts & starts working again.

I'll bet when you park it, you find a pretty large pool of water under it half an hour later, don't you?

Sorry, that's the nature of the beast - it's worse in humid weather, not so bad in dry weather. Pretty nearly all cars (with AC) do that unless the AC is designed oversized.

Try to check the blender control. .for cold and heater control right on passenger .or if u turn on the ac sw. The magnetic clucth working maybe some delayed and if still have the problem. .u need to clean all ac system..

Try to check the ignition coil, when you driving it become hot then the car dies end won't start. After awhile when it's cold, then it will start. Replace the ignition coil.
I hope it solves the problem

change air filter and fuel filter clean fuel injectors.faulty coolant temperature sensor will cause cold start problems.

Befor you replace the fan you need to check the thurmastat. Turn on heater and see if cools down the motor. Could also be your heater core going out. this supplys the water through your system to cool. as well as heat. good luck
If you do have to replace fan it should be under $100

I have a '97 Saturn SL and had the same problem. If the car was cold when I started it, it started up no problem. If I had just come back from driving it and turned the car off, let it sit for about 5 min, and tried to start it again, the starter would turn but the motor refused to turn over. I ended up replacing the O2 sensor and the engine temperature sensor. I haven't had a problem since then. O2 sensor can be kinda pricey though. Good luck!

All cars require a little priming. Try this, turn the key on, let it sit for about 30 seconds then try and start your car. When you first turn the key, the fuel pump will begin pushing fuel. My Mustang does the same thing when its been cold. Of course, in Tucson it does not get cold very often.

try checking your fuel tank for sediment it may be clogging the fuel pump and when it dies it falls away then when you start up again it gets sucked up

ok when ur sitting there no hot air is coming in to the air con radiator at front of car because your not driving
but when your driving it comes in but stays cold because the fan kicks in is your aircon fan working?

or does it need more gas thats what else can cause this