I'm having some construction done on my house and as a result, I've been parking in the grass. Its been rainy and cold (40F) in the morning. The last few mornings, the car would start right up but spit and sputter for 10-20 seconds. I'm going to bring this up with the dealer, but I suspect that they will tell me that they couldn't replicate the problem. There were not error messages. Any ideas as to what may be wrong?