car drives fine but at an idle either in park, drive or nuetral the idle becomes very rough. I changed air filter, I need to know where the fuel filter is . My engine light is also on. any help would be great.

Dummy me posted this reply on the new member site oops.Anyway I have a 2000 sable with same problem,another member said it was probably a vacuum leak.To damn cold in michigan for me to look,so I have been putting the car in neutral at stops.

Sounds like your iac(idle air controller) sometimes it can be cleaned with air intake cleaner but often not. To do so basically spray it down and move the piston back and forth a bit with a flathead. I usually then spray it again and let it sit upside down a bit and soak. This is because it has a electronic motor which often wears out. It is a silver piece about 1 1/2 or 2x as thick as a garden hose and about 4" long with a electronic plug on one end. The other end has 2 small bolts on it which mount it to the engine. I believe on yours it should be on top of the engine by the intake hose or on the drivers side of the engine. Before this however you may want to try seafoam. To best use seafoam I recommend using it through the vac lines feeding all cylenders (easier) or through the air intake (harder and not more effective). You may need to manipulate the throttle under the hood a bit while doing this. Before doing this be sure the car
is up to normal operating tempature otherwise the cleaning won't do
near as well of a job. I did it by removing the larger vac line which
enters just behind the throttle body and sucking it in through that. I
removed the end of the line which enters the small black box with
several vac lines going into it with a squeeze clip on it. Its located
basically straight up from the steering shaft right at the under the
lip of the hood. Then you slowly let it suck about 4-8 ounces of it in
then if the car doesn't stall itself turn it off and let sit for 5
minuts or so. Then turn it on and let it idle for a minute or so. It
will be smoking some give it a couple of quick taps of the gas pedel.
Let sit for under a minute then go for a short drive. If you have a
24v dohc try to get it above 4k so it also cleanes the secondaries as
well. The bottle of seafoam tells you what it cleans depending on how
it is used. It can be used as I mentioned or through the gas tank,
though as I mentioned is both faster, more effective and also helps
catylatic converter smell as well. It can even be used in oil to clean
(I have neaver found anyone recommending doing this for any car with
any cleaner).