It does more sound like ignition but it could be starving for fuel at high RPM. When was the last service done to it? Try just changing the fuel filter? How many miles are on the plugs?
Put a meter on the battery and see what voltage your charging at at idle. Nothing was changed since your tune correct? And it is a recent thing?
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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