Sounds like a vaccum leak to me. What I used to do to find them was get a can of starting fluid(ether) and spray it around the intake and if the idle surges then you have a leak.
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00 GT, K&N, 2 chamber Flowmasters, MAC Tree Killer, Pullies, UPR shifter, Weld Pro Stars, Nitto DR’s,MM#100 13.46@99.63
88 LX coupe X-FHP, 12pt Cage, UPR K-member, 31 spline rear, full spool, more to come
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