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Re: '91 Buick Les LTD stumbling/stalling
EGR stands for Exaust Gas Recirculation. The EGR valve opens when your engine is below operating temp to introduce exaust gases into your intake manifold for the purposes of heating the incoming air. By heating the incoming air, a better air to fuel mix is created producing more efficiency.
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"Sleeping is the only thing keeping me from killing all the stupid people on this planet."
"Of one that loved not wisely but too well;" (Othello, Act 5, Scene 2, Line 344)
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