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Street Sleeper
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1,450 Posts
Sounds like the TPS needs adjusting which will cause you delayed throttle respones. Have you reset the EFI fuse?? If not this is the reason the code 21 will still be there the ecu just remembers the code and stores it even if you fix the problem the code is still stored. Remove the EFI fuse from under the hood then press the brake peddle a few times to drain what charge is left in the circuits, then replace the fuse and your code 21 should be gone.
 
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