I am rooky here and need some help. My 90 300sl is hard to start when parked overnight and temperature is bellow 50 degrees. It take me a few minutes to finally get it to iddle at very low rpm. If i press more gas it stalls. I have to let it warm up for a few minutes before i can drive it.
I have a non original o2 sensor on the car that I am replacing with an OEM in the next couple of days. will that make any difference? what ese to check?, temperature sensor? cold start injector? or pther?
Pls help...weather is getting colder and it is a real problem...

Thanks
Blablabloom
90 300sl