really rough idle

I put in premium gas and cranked the boost controler to about 13 just for fun. Changed the plugs to Autolite 764 with new autolite professional series wires and the car ran great for a week. Now it idels rougher than before (600-700 rpm) and sometimes it hesitates around 3000 rpm. I changed the fuel filter a month ago, checked the fuel pump pressure at the same time, changed the O2 sensor about 2 weeks ago. I believe that the idle could be the IAC but what about the hesitation?

Huey

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87 Turbo coupe, 5spd, full factory options, custom 3 inch exhaust (falling off, "I dont think thats sopose to move there.")

Pull the codes, clean the IAC, try the old wires

Ill pull codes soon, as soon as it stops raining. The old wires were switched for the new ones because of the warrenty.

Huey

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87 Turbo coupe, 5spd, full factory options, custom 3 inch exhaust (falling off, "I dont think thats sopose to move there.")

Just buy Motorcraft wires every time and you will have no more hesitation, rough idle, and you won't have to type this message again.