No, I have my little K&N venting my valve covers to the air. My IAC still gets it's air through the main inlet tube on my powerpipe.
The computer feels a variable amount of air into the engine on deceleration to clean up emissions and avoid dieing. Adding unmetered air may cause strange leaning effects. That said, I see no reason why you couldn't play with the air flow through the EEC Tuner to control the over leaning condition.
98 Tan on Laser Red Rag Top Cobra
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Fully built and forged with Mahle pistons, SHM Blower cams, ported heads/nitrated valves
Novi 2000, 52# RC injectors, custom IC, Devilsown alky injection, SSR Intake, Steeda rails and -8 feed lines, 03 tank + Aviator dual pumps
Tuned with SCT Pro Racer Package (and everything else over the years)
Lot's of other stuff!