I recently bought an 02 Silverado 2500 Lb7 with California emisssions. Bought it about two weeks ago with no problems until a few days ago. When the truck is at operating temp it will smoke white, not a huge amount but definitely enough for concern. Very slight haze at idle but doesn’t happen when it’s cold. The longer the truck idles after being at operating temp it seems like the more smoke with come from the exhaust. Fuel mileage isn’t great but do not know how this truck well enough to say that there is a drop in mpg. Anybody have any ideas? Been told injectors which seems to be the standard for these trucks, but will injectors smoke only when warm?