Another thing to check would be the 10 pin connector on the back of the intake. There was a recall on these a while ago, and a jumper wire assembly was installed to match the miss-matched connections of the 10 pin connector. What you described sounds like one of the symptoms before the jumper wire assemble is installed.
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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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