My 96 Previa has had this problem where when its cold outside and the van has been sitting a while, it just doesn't want to start and after cranking for a while it finally putters to life but after about 7 or 8 minutes of on and off cranking. It also floods and I can smell fuel strongly, along with white smoke out the tail pipe. I let it sit for two days and it started right up but this morning after 7 hours and it was pretty cold outside it didn't want to start at all. I checked the cylinders and plugs after a 12 hour sit and they are dry(no leaking in the cylinders). I replaced the coolant temp sensor that helped for a little while but now back to the same. I cleaned the IAC as well but it still idles erratically so I'm gonna clean it again. Can anyone tell me with all these symptoms what it can be?