O2's would be my guess too, but I'd try to get some codes first. There are a few ways to pull codes. A code scanner which you can buy from Auto Zone (get one), or using a jumper wire/ohm meter/engine light. Here's some more info for you:
http://ratnin.home.mindspring.com/eec_test.htm
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Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels.
"The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance."
Griggs Racing
ICQ# 42269241
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