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I had a similar problem 2 years ago with my '89 MKIII. It turned out to be the Air Mass Meter, couldn't be repaired, got a replacement - this worked fine.

I remember, I also got some diagnostic code pointing to the AMM.

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Q: I have a 1989 Toyota supra and when i rev up the engine to 2000 - 3000 rpm's it cuts back to Idle. Please Help?
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