I believe he's asking if the egr valve could be causing his idle problems. How old is the egr valve? Have you check for codes to see if the old egr is throwing a code? Also, do you have any other mods to the car becides the TB?
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-91 Mustang Coupe, ex 4cyl (sold)
-99 F150, 3" lift, 35" Procomps, Magnaflow exhaust
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