My blazer wont start when its cold out. I can sit there and crank the engine over all i want until the battery dies, but it wont start, it seems like its not getting spark. So i talked to a friend of mines dad (mechanic for the local pontiac dealership) and he said it sounded like the Ignition Coil. So i replaced the coil, and the blazer ran fine for a few days, but today it wont start again.
I was told it had a tune up by the person i bought it from, but i'm not sure what all he did in the tune up.

Anyone have any ideas?

Ok, to save some money in the long run. I would have an automotive electrician look at it. Just to be safe.. It sounds to me that you have a positive short in the coil wiring. Or, it could be the computer going bad. I really couldnt tell ya what it is. Good Luck!

there ICMs are common to fail on those things.

other than that, id startby checking the battery connections, and clean all corrosion.

Quoted for truth. My 4.3 powered S10 just had one go out.
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this problem was fixed a long time ago...
this is an old thread