Engine high idle?

I have a 98 Pontiac Grand Am with a 3.1 with 100K miles. It has been idling up recently and no matter what will not idle down until I turn it off several times. I replaced the MAP sensor (like a mechanic told me to do) and it seemed to help for a while, but it went back the the same prob. (Also the brakes are very hard to push when it is revved up. So I was thinking a vacuum leak. But have not found one) The other more annoying problem I am having with this car is it just dies going down the road. I have to pull over and turn the car off, then restart it. It usually restarts, but sometimes does not. No one knows what is wrong with it. I have four kids and cannot be stuck on the side of the road. I need help with this please!

The Check engine light is on. I have had it tested and it says misfire on number 3. It has been like this for a while. I have replaced plugs wires and coil pack.

This problem started with the idle at 4,000rpm. I replaced the throttle control sensor which made no difference. I removed the throttle body, cleaned it out with carb cleaner, especially where the IAC comes in (I think that is where the main problem was). I checked vacuum lines. I replaced the gasket, changed the spark plugs, wires, air filter, and oil, but it is still idling from between 1,000 - 1,600. How do I get it to idle at 800rpm? Is there something else I can do. The check engine light is on, when it goes through the test, it pretty much says there is an issue, but not specific. Where should I look next? If there is a vaccum line that would most directly impact this, which one would it be? Thanks for your help guys!

I have a 97 Grand Am that has a high rpm starting problem. What can I do to keep it from idling so high?

Yes, the enine light was on; but recent repair(replacing idle air contol motor) reset codes(p0107, p0141, p0172, p0506)and engine light is now off. It goes to 3500 rpms, then calms down to 1000 rpms after putting in gear with foot on brake. This cycle must be repeated again; then it's normal until the car is turned off again. It happens when the car is hot or cold.

I have 1997 grand am gt with a 2.4L manual trans the car runs good at an idle get up to 55 mph while it has a load on it runs good when it levels off on straight away it starts bucking about 4or 5times before straightens out and continues to do it every time after you put a load on it any help would be appreciated Thanks

No the check engine light has never come on but a new fuel pump and fuel filter was installed about 4 months ago

No, but I will check those things and see what I get

I have been experiencing high RPM's that remain steady when I go 65-70 MPH and the RPM'S remain high until I let up off the gas a little. There is an exhaust leak in the car too.

Another thing that is happening is the car is slow to accelerate from a stop position. And the check engine light is on also.

I have a 1996 grand am 3.1. When you start it up it will idle just fine for a minute or two then it will idle up high and then idle really low and spit and sputter. To keep it from dying you have to keep your foor on the pedal. After you take off it will work itself out and will not act like that anymore, however if you shut it off for more than an hour it will do it again when you start it back up. I have replaced the map sensor, and the throttle control sensoe. I had it put back on the computer and it says the oxygen sensor had no activity even though its new as well. I got a good deal on the car and it runs really good after you get it going so I would love to know where to start.