This might not be a performance vehicle but it's a general question. I have a 2002 Chevy Express van L31 350 TBI. 143K miles. Recently cold starts have been real bad, in fact it won't even start when it's fully cold. I have sprayed TB cleaner into the TB and that gets it going on cold starts. Once it warms up, the rest of the day is fine, starts right up. I am trying to figure out if it might the the fuel pump bc I've known these to go out after a lot of miles.
Does anyone know of any cold start injector on this motor? Or any GM Tech here know what this might be. It has steadily gotten worse over the past few weeks. It went from longer cranking when cold to just not starting. Any help is appreciated.
Thanks,
Mark

 

Sounds like it could be a coolant tem sensor. Not sure on the procedure to test it though.