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Hey just thought I could quote the Chiltons that came with my 79 242 GT as it says"The Lambda Sond Feedback System is a self-tuning engine control system designed to reduce emissions and improve fuel economy." Thats why your car could be getting less than ideal fuel milage! And that question about the egr valve, did you plug the hole where it was supposed to go or did you just leave it open? What did you do with this port? The egr valve wouldn't effect the fuel economy too much unless you left the opening to the intake open and then it would be leaning out the mixture? Just something to think of.
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