my 2009 hyundai sonata v6 cold start idle is erratic. the dealer gets it right for a day or two then it starts again. when I start it up on a cold day, 32 degrees, it runs up to 2100 rpm, drops to 1000, and fluctuates between the two several times in the first 5 seconds after start. after 1 minute warmup when i drive away it lurches and then almost dies until warm. The dealer did the service bulletin fix on the cold start and that helped for three days then right back again. What are we doing wrong?
2009 Hyundai sonata limited v6
letting the dealer do three times.
The bulletin was probably done incorrectly, have them do it again.