Expert: Sean Halliday - 6/7/2010

Question
Well me and my wife have a 1999 ford contour a 4 cylinder and when are car is in park it seems as the car is about to shut off like it's losing power and I replaced the oxygen sensor and the car still dose it and sometimes the car shuts off when my wife starts it in the morning could this be the fuel filter being dirty the computer reads system to lean ( bank 1) what can I do to fix this

Answer
Too lean bank 1 can be a bad MAF sensor or dirty sensor.Try cleaning the inside with the correct spray and there are lots of sites on google with this info.A lean intake can also be a air leak down stream from the sensor so look for leaks and cracks in the boot.Other possibility is a leak at the intake manifold.Test vacuum first with a tester.Cheap testers are available at all part stores.