Pontiac Firebird 1967-2002 - Rough running

I have a 1994 Pont. Firebird Formula 5.7L LT1. After the engine warms up it will load up and cut out under acceleration. When it's cold it runs great. I've replaced the plugs and plug wires, and the EGR valve. What might the problem be? Could the plug wires be a bad set and need to be replaced again? Has anyone else had this problem, Please help.
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Nick

Anyone?????? Am I in the right forum?

You might check your TPS sensor as it may be bad causing rich running when Warm ??
Or an Oxygen sensor ?

Do you have a check engine lite lit ? If so, check your codes n go from there !

All else fails, dump it and install a LS1.. :-) just kidding....

Have a sensor testor, and it said the TPS was fine. Well, I think it did, it showed the TPS moving the whole range while moving the throtle. No SES lights come on. Haven't checked O2 sensors yet.
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Nick

Thanks a lot David, it was the O2 sensors. Both were bad. One had a broken ground wire with a open circut, and the other had both circuts open. Changed them out, and all runs well. Thanks again! :nod:
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Nick