help have a gremlin in my camaro,ses light and 02 sensors

i have this gremlin in my z 28 the ses light comes on about 1 outa 5 times when i rev it to about 5 grand and stays on for a while which makes the car run ruff then it goes out and every thing goes back to normal the code that comes up is low voltage to o2 sensors the ones in the cats twords the rear i hade both 02 sensors replaced and in doing that the chevy dealer ****ed up the threads on the one cat so i had a local more trusted garage weld a ring in there and screw the o2s back in so ne way i have an slp loud mouth exaust on there and i have had the engine replaced with the same as stock im wondering what it could be the garage dosent' no and they r about to start guessing so i need input please help i was wondering if it was a computer problem ne help would be aprecieated thanx

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99' Chevy Camaro Z-28
-K&N F.I.P.I.K.
-Eibach 1.5" drop kit
-SLP LM exhaust
-neon on the floorboards
- Looking for a turbo setup, any tips hit me up bushmaster200021666@yahoo.com

You have a better chance of getting this answered on "LS1 Tech"..... moving it there.



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Fred
94 Formula A3: 381/TH400/N2O

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11.513@115.59 on motor; 11.162@127.67, 1.643 60' on a 125-shot. Going with a 275-shot this year