idle problems
 

When i turn on my car the rpm goes from 1 to 0 then turns off, but if i hold the gas pedal down for a couple of seconds at 1 on the rpm and then let go of the gas the car will stay running and mark 1 on the rpm guage. But as soon as i put it in drive the rpms will go down and the car will turn off if i dont hold the gas. My car is a 1992 honda civic with a 1.5 16 vavle engine with automatic transmisson. The car has a full tuneup and the engine light is on i belive its a fuel filter or injector clog but when im driving the car over 20 theres no problems only when i come to a stop. Has anyone had this problem or know what wrong with my car any help will be greatly apreciated.

welcome to the forum. check and clean your idle control valve, look for vacuum leaks