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Q: uncontrolled revving when idling, engine failure on 1992 BMW 325i

the car drove fine until i got caught in traffic and was idling with my foot on the brake, however, the engine started 'jumping' as if i was pressing the accelerator. i also noticed the rpm's jumping as it did, and then the engine died. i turn the ignition again and the car started, but stalled after a few seconds, so i decided to turn it on again and give it gas, but the car would roll slowly and then give on me again.
any ideas?
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Possibly the throttle position sensor is failing but you need to have a tech diagnose this before changing parts as when the throttle position sensor fails it will run poorly.
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