Idle control and throttle position sensor

Check and clean the idle air control motor and the air passages it controls. If not that, it may be a problem with the throttle position sensor.

I had a 91 with the same problem. Here's some causes. 1 check the rubber hose that runs from the air filter box to the throttle body. If it has rips or tears, from rubber drying out, it will cause a vacuum leak and car will not go into over drive. 2 check the idle air control valve on the throttle body housing, if it doesn't open up as it's suppose to, the car won't go into over drive either. 3 check throttle position sensor. If none of the 3 work, have vehicle looked at by a mechanic.

reset the ECM using a scan tool as the cleaning process of the maf sensor has altered the parameters

go to your local auto parts store and they should have a scanner but it sounds like eather the Throttle Position Sensor or one of the O2 (oxygen Sensors)

i would start with cleaning the throttle body and idle control valve

Sounds like the Throttle Position sensor or the Idle Air Control Valve causing the issue

Buy a can of CRC Throttle valve cleaner and clean the idle speed control valve and the throttle bore and throttle valve, this should help.

Sounds like to me your throttle positioning sensor is not set right. Try adjusting it or maybe a friend or take to a local mechanic.

what is thye correct idle rpm in park 1999 amigo

The previous solution to check the idle air contol is in the correct area but needs some clarification.
The idle control is accomplished by two parts: Throttle position sensor ( $35 at Autozone) and idle contol valve approx $190. I replaced the throttle position sensor about a week ago and it runs perfect
to date but am a skeptic after almost two years of dealer incompetance. I researched all the sensors and failure symptoms on the internet and the throttle position sensor failure symptoms matched mine
exactly. See http://wiki.seloc.org/a/Throttle _Position_Sensor