The 98 z24 has no plug wires or distributor/rotor button hard to check whats not there. Might try o2 sensor up stream one or you can get a good idea run to local parts shop see if they will let you use thier code reader Oreiley's does this read it clear the codes then run for a few minutes then read again. Resetting right away will get rid of previous codes not causing problems.
If you replaced the plugs in wires in it is still doing it id looking in to changeing the dis cap in rotor bug in the dist or you mite have bad gas in it
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