99 tahoe no spark or start

ive got a 99 tahoe that wont start ,was running earlier ,but now wont start.engine will turn over , just wont fire.changed the coil,cap ,rotor, and crank sensor , but still no spark.checked fuel and pump both are ok.pulled #1 spark plug and no spark.also checked to see if distributor is working properly,seems to be ok .now im stumped .any suggestions please

Need to check for 12v at the coil with the key in the run & start positions. If you don't have it, it could be an Ign Sw issue (common) or wiring or fuses.

it was coil and ignition mod but now it runs rough and check engine light is on

I see you replaced the crank sensor. This usually requires a "crank variation learn" procedure. Needs a high end scan tool in the hands of a knowledgeable technician.

Also with the CEL on there are active codes. What are they?

Put old crank sensor back in still runs. Runs fine over 70. But under sputters and back fires. Pulled number 1 plug looks like engine has been running lean for some time. Going to replace plugs and wires and scan code