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Hey folks been under the weather for the last 3 years. Looking to get back into my  Baby 1990 Reattta convertible. Idles around 25 cold and 30 when warm. How do I do the diagnostics on it. All the vac hoses have been changed throttle body has been cleaned as well as the MAF with MAF cleaner  

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IAC could be out of calibration.......if it has one......been years since I was under the hood of a 90 Buick.

 

Idle Air Control Motor............next to the throttle body. First check if you unplug the MAP or MAS to see if the car has computer control.....if it doesn’t, you say will go down hill.

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