Hi Everyone, first task with my new Previa is to figure out why I am having bad idle once hot. I started by taking out the throttle body, EGR, and EGR modulator. Two culprits found.

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All the vacuum hoses to the modulator were cracked and/or fully blocked. When taking apart the modulator the filter was completely solid and caked with carbon. I tried cleaning it out but I think it is a total loss. I just ordered a new one (Toyota part number 25870-76010).

The other problem I found was that the intake tube to the throttle body is falling apart and was fully cranked off at what I believe is the crank case vent that connects between the intake hose and the oil fill. It is cracked almost completely off where shown here:
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So I ordered a new Dorman intake hose and hopefully that will be sorted (Toyota part number 17881-76050).

The throttle body was really quite clean and the IAC was also smooth and clean. I gave both a thorough cleaning anyway, but I very much doubt either of those are my problem.

Njordi goes into my mechanic on Wednesday for a block test.