What is making my 1999 blazer missing and i put spurk pugs and wire,distributor cap ,crack sensor why is it still missing

Was it missing before you changed the wires, plugs etc?
are you sure the gap is right. Did you check or replace the control module.
Any water or moisture in the distributor, any vacuum leak.
is it hard to start?... Check control mod, timing, wires etc, egr for leak

A faulty ignition module could be the problem. some vehicles have one for the whole system while others have multiples. you can test individual cylinders by first removing the fuel pump relay, then one at a time remove the spark plugs and ground it to the engine block while a helper hits the key. you should clearly be able to see a spark jump across the spark plug. you can also purchase a diagnostic tool which you hold over the wire while a helper turns the key and it reads the current in an inductive manner. if all cylinders are receiving spark then your timing may be out, in some newer (96 and up) vehicles fine tuning of the timing is achieved via ecm in conjunction with the ignition module and cam/crank sensors. in older and a few 96 and up vehicles timing is done solely by the clock position of the distributor. a timing gun can be used to establish correct timing (refer to owners manual/repair manual for proper advancement or retard of ignition timing)



in the event that you have a properly working and timed ignition its most likely you have a burnt valve or dead cylinder, a compression gauge is the best way of diagnosing these issues.



lastly vortec fuel injection systems are finicky about fuel pressure, incorrect fuel pressure will cause the vehicle to run rough,stall ect...most run right around 60psi you can test your system by hooking a test gauge up to your service port.