1994 ford f150 higher idle?

94 f150 5.8 after I start it, it idles up to 1100 rpm. Shortly after the check engine light comes on

Time for a full inspection and tune up, maybe the fuel injectors, throttle body, plugs, air filter, gas line filter, carbon filter etc let the professional's fix this.

And the ECM trouble code is?

Could be just a vacuum leak causing a high idle but a slightly higher idle speed… 1000 rpm's or so… On cold start is normal. It should settle down after a few minutes. Check the PCV, vacuum hoses or air intake ducts for damage like cracks, split, loose, etc. Check to see what trouble codes you are getting which might also help diagnose a problem area.

https://www.fordf150.net/howto/eecivcodes.php

http://straighttalkautomotive.com/OBD1/ford-OBD-I.html

Take the vehicle to a auto parts store they will read the trouble code and that will tell you what need to be done.

Yea, first thing is look for a vacuum leak…

Maybe a sticking IAC valve. But OK, it does something wrong. Then the computer turns on the check engine light to tell you it knows something's wrong. You need to check the codes and see what the computer is trying to tell you first.

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