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Ford Master
3,218 Answers
- Posted on Apr 06, 2015
Re: why 94 ranger 4.0 rpms 2200 take breather off rev up...
The idle air control motor may be defective/sticky. The computer gives it a command but doesn't realize the motor is not following the command and therefore no check engine light. You can remove the IAC and try to clean it with carb spray
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