Try turning off engine for a minute and restarting it when you get to the lower altitude.
SOURCE: Toyota Noah with 1AZ FSE engine misfiring in cylinder 1 and 4 but 2 and 3 working properly
According to the computer, it seems the Noah was not made for USA market however, in this country, the first thing to check is the spark plugs themselves; and after that, the "coil pack", which is the individual coil for each spark plug.
Then test the distributor.
God bless your efforts.
SOURCE: My 2007 Toyota noah 1az engine d4 shut down when I accelerate
Any recent work performed? Is the engine light on or flashing? Are any warning lights on or flashing? Hypothetically if your minivan went in for an oil change and the air filter was checked. If the technician accidentally left the related ducting loose. The MAF sensor would received invalid information which could cause the vehicle to stall. Also if the MAF sensor was left loose or unplugged you would have the same symptoms. Both should have triggered the engine light. Please write back with more information or questions. Good Luck.
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