Replacing the vent tube from the fuel pressure regulator should have no effect on engine function. A bad one will simply allow unfiltered air to enter the closed system, and fumes to escape. My guess is you disturbed something else in the process. Check for hardened and cracked idle circuit hoses - they are thicker, rubber ones, and a vacuum leak here will cause improper metering by the airflow meter.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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