I Have A 91 Camaro Z-28 (305 TPI 5 Speed) When The Car Warms Up It Starts To Idle Rough, Fluctuating Between 500-900 RPM's And Sometimes It Will Die. The car Has Had A Full Tune up About A Month Ago And A New O2 and TPS sensor.........Thanks For Any Help...................Also Some Fluctuating When Held Steady At Higher RPM's +/- 200

 

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Maybe the IAC valve is sticking or dirty,might need to be replaced.
It's under the tps sensor going into the valve body side ways.

 

It may be a good idea to do a power balance test on the injectors.

 

Testing the resistance on the injectors when cold and warm should also help you rule them out.
I had the same problem and found 2 bad injectors.