2003 Blazer hard start at cold
 

Hello all
i have a 2003 Blazer my 3rd one 1993 1997 now 2003 all been excellent
My current Blazer has been giving me a hard start problem when.it suddenly got cold for winter the last 3 weeks. I’ve changed fuel filter. Spark plugs. Rotor cap. Also to mention the check engine light comes on and off but has stayed permanent for a few months the code was a code for the gas cap I believed. As well as it would have a idle very low at 400rpm and go to 700 the be here and there. I read some where about the mass airflow. I changed it and the Blazer started up right away. The check engine light too. Just a quick FYI as well my fuel pressure read 62psi before the change and after at the prestart.