90 rs 305 TBI. i got a high idle at about 3000- 4000 rpm at start up and once it idles down and i rev it or put it in gear it jumps back up. i need help asap. thanks
Tuned Performance
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Have you checked for vacuum leaks ?
Check the base of the tbi .
Check the base of the tbi .
DynoDave43
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Jun 4, 2026
- Join DateAug 2013
- LocationMICHIGAN
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- Car1988 Trans Am
- EngineL03
- Transmission700R4
- Axle/Gears10 Bolt 2.73 Open
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Quote:
Check the base of the tbi .
Originally Posted by Tuned Performance
Have you checked for vacuum leaks ?Check the base of the tbi .
They are famous for failed base gaskets.