This is strange. My 2000 Silverado with the small V8, manually tranny, 4x4,
50K miles very rarely (once every few months) just doesn't idle upon start-up. The RPMs drop and it stalls out (in neutral). I can maintain the idle speed by pushing on the throttle and if I drive it a bit the problem goes away. This last occurred during a fall morning, not cold weather. No engine warning lights, no other symptoms and it runs great otherwise. Any ideas? Thanks. John