1999 Chevy S-10 engine wont start

Ignition timing is computer controlled. Nothing you can do about that, unless you had a code about the crank sensor.
Do you hear the relay click in the glove box when you turn the key to on? Is the fuel pump buzzing also? If you hear those sounds then your pump is working. If you can check the fuel pressure. You may not be getting enough pressure due to plugged fuel filter or bad pump.
Stock coils commonly wear out on those vehicles. You are getting spark, but it may not be strong enough. You may want try another coil.