Codes P0171 & P0174
My check engine light came on today with these codes P0174 & P0171. For the past week or two I have been having problems with the way my car has been driving. I took it to the dealer and they weren't sure what it was but that it might be crankcase valve and to come back when the car is completely messed up. The car rpms jump up and down and sometimes make a loud whistle noise. Both of these symptoms aren't always present, most of the time it drives perfect. I'm getting frustrated since the dealer were no help. So... does anyone have any suggestions of what this could be? Is it the crankcase valve? The dealer said that if it is the crankcase valve that the valve cover need to be replace since its now integrated in the valve cover. Is that true? Also my car was previously flooded a few months ago, not sure its related or not.