You will get a code throw without the smog pump hooked up, because of the vac that are no longer being used. I removed mine a year ago, with no adverse problems.
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NewEngland Auto www.baystategearheads.com
-91 Mustang Coupe, ex 4cyl (sold)
-99 F150, 3" lift, 35" Procomps, Magnaflow exhaust
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