If you have an old lawn mower spark plug (or any spark plug), pull off any spark plug wire and attach the old plug to it. Lay the plug down on on a grounded metal part of the engine and have someone crank the engine over and watch for spark. My guess is you have spark but no fuel. A bad fuel pump is common for GM.
are you getting spark?
Replace the coolant temp sensor.
Probably the fuel pump is bad.
Yes, the doors from a 98 Chevy Blazer will fit a 2001 Chevy Blazer with a little moderation.
I would replace the ignetion module that is in the distributor.
do you mean it cranks, but will not start?
Sounds to me like your Vacum booster behind the master cylinder is weak or bad!
Yes.
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Yes