I have a 1999 Trans Am stock with a 411 pcm running flex fuel os from a 2002 Tahoe. Having an issue when cold with idle surging to 2500 rpm, was doing it when warm as well and I reduced the numbers in startup airflow initial and friction airflow initial and when warm the idle is acceptable, but it still surges at startup when under 140 or so, and then the idle fluctuates. Any sugeestions as to where to fix this in the tune?
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