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so i was listening to this and it sounds like the following.
The engine is increasing speed then falling. Now i have had several things cause this for me before.
1. The TPS is something to check. You can check it with two methods, one is by voltage and the other is by resistance. In either case the transition should be smooth and no dead spots. If your using the voltage method, you should get about 1v at idle and about 4-5v with the throttle WOT. Resistance, wise, you should see around 1000k at idle, and about 5000k WOT.
The engine does not need to be running to do this test.
2. Vacuum leak. A vacuum leak can cause the idle to do the same thing. The rpms are getting to high from the leak so the computer is trying to lower it, hense the looping idle.
Also, what rpm is it fluxuating between?
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