Reset your BASE idle.
As monty sort of said.
What he didn't tell you, is that to do this you need to disconnect the
IAC (Idle airspeed controller)
Procedure as follows;
Run car to normal operating temperature.
Disconnect the
IAC connecter.
Wind the idle up manually using the bolt on the t-body (so your car will actually start, without stalling - when you disconnect the
iac it will just want to stall)
Unwind the bolt until your idle sits at 550-600rpm?
Stop car, reconnect
IAC connecter
Reset
ECU
That has set your base idle, after a little bit of running your idle should settle back to approx 800-900rpm.
If it still plays up after this... maybe check your TPS voltage (position).. although I'm unsure if this would have any affect on your idle.
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