my 01 t5 with 67k miles has twice gone into what my mechanic calls "limp home mode." It slows to a crawl, won't rev over 2500 rpm, and when i park it, it runs very rough and nearly stalls.

both times a "reduced performance" (really!) message appears on my dash. once i got a yellow warning light in the tirangle in the middle of the dash and once i got a red triangle. the manual says call the dealer on yellow, park it immediately on red. the manual says nothing about this reduced performance message.

as you might expect, after it sits a while, everything is fine. when my mechanic uses his diagnostic computer on it, he finds no codes.

i have noticed a very slight hesitation at times, rather like the a/c cutting on and off--mostly at even throttle around 3000 rpm--and i'm wondering if the two conditions are related.

any ideas?