I have had a used 2002 Toyota Sienna ( 68k miles ) for about a year and
a half. One day in the summer, I drove it to the mountains. Once I
arrived, the van was shut off for about a couple of hours...then the
van had trouble running. It would start, but immediately shut off. If I
keep my foot on the gas pedal it would rev up, but stall out as soon as
I took my foot off the gas. Of course, you can't put it in gear
without your foot on the brake. Eventually, I thought to open up the
gas cap, which appeared to release a large amount of pressure. Then the
van started normally and drove fine.

Well, it happened again this weekend. Except, the van was at home and
had only been driven around town the day before. I opened up the gas
cap and a little pressure came out. But, even after that, the van would
only run if I kept a foot on the gas. Again, it would rev up and
immediately stop when I let off the gas.

The indicator lights seems to turn off while the engine is running.

What could cause this? Something going foul in the Electronics? I dread
taking any vehicle in that has an intermittent problem.

Thanks for your suggestions.

Dig314