Finally got a new used car (found it from carsdirect.com; bought it from a dealership). Will have the engine thoroughly inspected by a mechanic tomorrow.
When the engine is cold, it revs up to 2000 rpm, then falls down to say
1300 rpm, then 10 seconds later, revs up to a little less than 2000 rpm (1800 rpm, say) then falls down to a little less than 1300 rpm (1200 rpm, say). Kept doing this until the "low" rpm reading was about 1000 rpm, but only kept the engine on for about a minute - we were waiting for a friend. (The heater was on full blast, by the way.)
Is this normal? I never noticed this on my '96 camry, or on my parents' 2001 camry.