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Did you do it like this:
Fully warm up the car.
Turn car OFF.
Disconnect the electrical connector for the AAC valve (yellow connector).
Start car back up.
Turn the Base Idle Screw clockwise until the idle drops to about 650 RPM.
Reconnect the AAC valve's connector.
The idle should quickly raise, then gradually settle down to about 750 RPM.
But if the car was fine before it’s more likely the problem is somewhere else.
Did you clean the connectors to the CAS, TPS & PTU?
Did you check the TPS voltage? It may need adjusting, it’s more likely to go out than the AAC (but you never know).
Also check the timing with a timing light (can go out a bit over time) should be 15 TDC.
Also if all else is OK you may want to remove and clean the IAA
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