1994 Ford F-250 Check engine light

1994 FORD F-250
165,000 MILES
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BUMP62
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  • 2 POSTS
When starting truck it high idles and takes long time to come down then drive it come to either stop light or go to park still high idles bad then while driving if check engine light comes on power seems to be reduced some then when light goes out transmission shifts hard into gear I have replaced the TPS about a year ago have had recent tuneup and oil and filters any help would be appreciated thanks
Jul 14, 2013 at 1:50 PM
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JACOBANDNICKOLAS
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  • 110,175 POSTS
check for vacuum leaks and check the idle air control valve (IAC) located on the throttle body. The IAC is responsible for the engine idle speed.
Jul 14, 2013 at 7:42 PM
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BUMP62
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Thank you for info I will check that
Jul 14, 2013 at 10:57 PM
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JACOBANDNICKOLAS
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Let me know what you find.
Jul 15, 2013 at 8:43 PM