This problem was on the '99 Cobra. A PR nightmare for Ford and is the direct cause of no Cobra's produced for the 2000 model year.
My understanding was that they were underperfoming by about 20 - 30 hp. "The fix" as it is called consisted of a honed intake manifold, new cat-back, belt tensioner and computer re-flash.
To find more about this problem, search the forums on these boards:
www.scoa.org
www.stangnet.com
Hope it helps.
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'93 Cobra, 1 5/8" FMS shorty headers, 2 1/2" Mac cat-pipes, Borla cat-back, 180 degree thermostat, 4" ram air, 3.55 gears, March pulleys, strut tower brace, Kenne Bell flip chip, Crane Hi-6 ignition, Crane coil, Global West Trac-Link, Hurst chrome shifter, Canton oil pan, BFG g-force kd tires
'99 L, JL Stage II Ram Air, Bassani cat-pipes, Borla cat-back, R9 Superchip, Cal-Tracs, Chassis Tech 2" drop shackles, Water Wetter
[This message has been edited by BlueOvalBolt (edited 05-11-2001).]