Car went retarded over night, please help!

[1991S13]

1991 240sx coupe, auto KA-DE

Last time I drove my car was Sunday night, and everything was fine...

Today I get in to drive across town for something, and it won't shift into 2nd gear. I moved the shifter from Drive to 2 and then it went in, so I moved it back to Drive and everything seemed alright....

Now when I put it in Park or Nuetral, it idles at 2,000 rpm; and in gear it idles at 1,100 (used to idle around 700) and feels like it is pulling when Im holding the brakes. So I can drive fine, just when I come to a stop sign it feels like it's going to pull me through, and when I put it in park it jumps up to 2k.

I was thinking could it just be that I need to adjust the idle? But I don't understand how it could of went out of adjustment just sitting there. I checked for disconnected vacuum lines and everything was plugged in. This is my only source of transportation, and I have to go back to school tomorrow, so please help me!

Thanks in advance.
Modified by 1991S13 at 1:29 PM 2/22/2005

[steve s14]

first check to make sure the throttle is closing all the way and nothing is holding it open. if that checks out, it sounds like there might be a vacuum leak some where. with the engine cold, start it up and spray around the intake area with a can of carb cleaner or something similar, to see if the idle changes when you spray in a particular area. if it does change, thats where the vacuum leak is. if you suspect it has a leaking intake gasket, you can pour water around the intake and cylinder head area and listen for a sucking sound and idle change.

[1991S13]

Thanks...

I took the intake tube off and cleaned the throttle body with some carb cleaner, now it idle's like it used to. There was a lot of carbon built up around the plate, so it wasn't closing all the way.