1984 Ford Escort high idle upon ignition

The cares runs fine upon starting up and instantly it starts to idle high, As I stated it runs fine for long distace and then comes to make if you or sitting at a light it begins to idle high after about 3 min. My question to you is, and pelase only specific diretions how do I locate the idle screw to adjust the idle where is it located it is fuel injected im used to the caurb, etc please if any 1 can help please shre. Thanks