91 Ford F150 Repair Manual
Ford F-150 The F-150, the most popular variant from Ford F-series, is a full-size pickup truck from Ford Motor Company since 1948. Favored by truckers all across USA, it comes with the tag, 'Most guys depend on F 150 to get the job done.' Originally conceived as a rugged, no-frills workhorse, over the last six decades, the Ford F- 150 has morphed into a well-appointed, versatile pickup truck. F-150 received an overall 'Poor' rating by the Insurance Institute for Highway Safety (IIHS) in the frontal offset test, and was ranked the 2nd Worst Performing Vehicle behind the 1997?2005 GM U-platform minivans.
91 Ford F150 Repair Manual
1991 Ford F150 Repair Manual Free
Did you also change the Coolant Temperature Sensor? If it is reading wrong, the computer may not realize the engine is cold, and won't increase the gas for that. Spray some carb cleaner around the outside of the throttle shaft, if engine speed increases, that could be a vacuum leak. I've never heard of that, but anything is possible. It sounds like it would have to be a serious air or vacuum leak to cause your problem. Have you blocked off the power brake booster to check if that is leaking? You might want to do a compression test to see if there is any internal mechanical damage.
2015 softail user manual. Answered on Jun 09, 2017.