I had a very similar issue with my car. Idle but zero throttle. After completing an ECU scan it ended up being my throttle position sensor. (gas pedal) Bought a new one from Rockauto for $43.00 and completely resolved the problem.
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1968 Firebird
lS3/T56/9"/24 Pistons/Forgeline VX1s/Faulty "Ride Height Too Low" Shocks
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