95 3.8 won't start sometimes

Hi everyone,
I have a 95 v6 that won't start sometimes when it is below 60 degrees because of no fire at the plugs. No codes come up on the scanner when it does start. And when it starts it runs fine. It has been doing this all summer (real pain). Does anyone think that it could be the ign. switch? Any ideas on how to check for problems? The car is stock except for a cold air intake and flowmaster cat-back.
Thanks in advance for the help.
BTW it is an automatic.
Steve

How do you know there is no spark at the plugs? Does the engine crank over OK but just not start or is it sluggish?

I checked it for spark, and it turns over fine just will not start.

That could be a lot of things, even the key. I would take it to a good shop.

does MIL (check engine light) turn off during cranking when engine won't start??

Hey Cjones thanks for the reply. I can't answer that right now because the car has been starting fine (warm temps). If I had to guess I would say that the light goes out.....But as soon as it does not start I'll let you know.
Thanks
Steve