why wont my 1999 chevrolet start?

This is like a shot in the dark, to answer this question. Lets look at a simple fast guide for any manufactures internal combustion engine a NO start... Only 3 things can prevent an engine from running (overly simple) 1. Mechanical hardware, meaning broken pistons ,crank, cam,valves, etc. lets say its turning and OK 2. fuel is it getting fuel? fuel pump, filter, relay, fuse, gas in tank yes really! 3. Ignition, coil,COP, wires, or we'll call it spark to the cylinder spark plugs... Yes, there can be many causes for these 1-3 systems NOT to function, BUT with good hardware i.e. compression, correct fuel, and proper ignition it MUST run. I suggest a simple code reader as a basic start, OBDII is a federal standard in 1996 for domestics take advantage of this! plug in... Ann Arbor, MI