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Engine spike gerald hoffman 6-26-12  
What would make a 1990 ford ranger spike between 1 and 2 rpms when just sitting and idling? Like when I start it it idles at 1 rpm or just a hair above then after it sits for a min it starts spiking between 1 and 11/2 and 2 rpms
Re: engine spike BUBBA THE BUS TECH 6-27-12  
Usually the computer will only do this if you have a miss or other run problem.
The other things that can be dificult to track back are sticky egr valve, worn throttle shaft, poor or bad fuel injectors, throttle not returning completly to idle.
Good Luck
Re: engine spike Phil Feinstein 6-27-12  
If this happens at idle under no load, it would point to a bad or sticking Idle Air Control (IAC) valve. Your model is EEC4, so this should set a code and be easy to retrieve.

If you have access to a code scanner, I suggest running a "Key on, Engine running" test (KOER). If the problem is an IAC valve, this will show it immediately.

Hope that helps!
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