OK guys. This topic may have been covered before, but I can't find it on a search. When starting in the cold weather the rpms are fine then drop to almost a stall, fine, drop..... It also does it when driving. I'll floor it and nothing, then all the sudden I get thrown back and it takes off. It will do this until the engine is warm and then it seems OK. It happened last spring too. I changed the EGR and fuel filter and the problem stopped. Now I think it was just because the weather got warmer. Is it a sensor? If so, where is it?