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Ive had a 94 and still have a 98. When my car acts like that and it's happened more than three or 4 times already. It's usually the TPS Throttle Position Sensor. Simple part, simple bolt in job done in 3 minutes.
Check wires. One small crack in a wire will totally kill your performance
When's the last time you checked your 02 sensors. You said you just did headers and exhaust? Did they put in the correct downstream 02 sims? Sensors?
Doesn't sound like anything major.
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