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Hey there, i have a 2001 is300 with the 2jzge it was an automatic but has been swapped to manual. I have this issue where when i start the car it idles at 3k rpm for a minute then goes down to 1700 or so. After that it drives normal until the car is warm. Once it gets warm the car idles rough at low speeds and in neutral. It sounds kindof like an old chevy which is weird. Im thinking its MAF or PCV? Anyone have insight on this?
 

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You can check those. But did you do the swap? The reason I ask is that if the wiring bypass to the automatic system was not done right. It can cause an issue.
 

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The reason I ask. If the bypass was not done right. It will be in limp mode all the time. Does you auto cluster show in 1st or 2nd gear? Or did they swap a whole harness an ECU?
 
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