Once my car warms up every 30 secs. or so at idle the RPM will drop to about 300 and then pick right back up It does it consistently and I have ignored it because there is no noticable performance impact by this.

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91 Camaro RS, 305 TBI
No mods yet...Hopefully:
Convert to dual-cat with headers and Borla catback exhaust.
Edelbrock MPFI system.
RAM air hood & Z28 wing.
Z28 cam.
ABS system.
Positraction rearend with rear disc brakes.
Rebuilt front and rearend suspension with polygraphite bushings.
Strutbrace.
Rollbar.

 

Sounds like it's related to either the IAC motor or the TPS.



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89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."