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The EGR valve is used to reduce emissions and pass environmental testing for your vehicle (especially in California). The EGR (Exhaust Gas Recirculation) valve is part of the vacuum system and a faulty valve will cause vacuum instability (leaking) and could cause engine stumbling. If you can find a way to eliminate it by capping the placeholder you might not suffer major difficulty, however, there is a sensor for its use and the computer (ECM) could induce erratic commands to the entire system as a whole with its removal. The 1995 Pontiac Firebird is a sensor rich computer controlled vehicle.

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