Joined
·
124 Posts
I have a 2004 Mercury Sable with the DOHC. When you first start the car the idle goes slightly up and down (between 700 and 800 RPM). Once in a great while the car will sputter/miss ever so slightly when idling. As of a couple days ago when you are crusing (40 MPH and above) and push the gas pedal to accelerate you can feel the car miss and jerk. You only feel the miss/jerk if you push the gas pedal to gain a little speed...it does not miss if you have to hit passing gear (put the hammer down). The miss/jerk is really noticeable if you are going up a hill and push the gas pedal slightly to keep your speed. To put it in another perspective lets say you are doing 40MPH and you gradually accelerate to 45MPH...that is when you feel the missing/jerking. I opened the hood and listened to the engine run. I noticed when I jab the gas pedal you hear a rushing sound (kind of like air)...the car stumbles for a second then revs up. If I gradually give the engine more gas the engine does not stumble. It sounds like a vaccum leak but I am not sure. It sounds like the rushing noise is coming from under the upper intake manifold. Again this noise is only noticeable when you quickly push the gas pedal.
I have followed all maintanence on the car. The fuel filter is changed every year. The plugs are original but they are supposed to be good for 100,000 miles...my car has 91,600 miles.
Any advice is greatly appreciated.
I have followed all maintanence on the car. The fuel filter is changed every year. The plugs are original but they are supposed to be good for 100,000 miles...my car has 91,600 miles.
Any advice is greatly appreciated.