Throttle body calibration drift..

[Dean McQueen]

There are the throttle position sensor voltages(TPS 1/TPS 2) that need to be correct for it to go to the correct commanded angles. Determined by the position of a magnet fixed to the rotation of the throttle.
If they are wrong you can get problems ranging from idle/ drivability issues to throttle stuck Codes, not really what you are describing. Its hard for me to imagine that magent came loose on a stock TB.
Look up a whipple throttle body PDF for TPS 2 forced closed voltage range. .4v-.45v when forced closed iirc.
Can't hurt to check it, but throttle control is probably not your issue.
Get a log of the car peforming well, and one of it not performing well, compare to see what changed.

Hey, i'm pretty new to,forced induction also. Can anyone tell me which wires to hook a volt meter to to get the TPS2 voltage to adjust to .40-.45 volts. 2112 limp is really getting old PLEASE AND THANKYOU, Dean

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[Dean McQueen]

There appears to be 6 at the TPS plug.

 

[Dean McQueen]

I've already got to the adjustment part but my reader only shows % not volts

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