Here's one for the hive mind: My car starts fine (although much quicker after sitting for a few days), idles fine for 15 seconds and then sputters like its losing a cylinder, then will smooth out within a minute. Maybe related, it also idles low (just under 500rpm all the time, slightly lower in hot...

Its that time...the local dealer just quoted $800+ to do it. The part can be had for $300-ish. Time to get dirty. Some help as to where to start would be appreciated.

Thanks-