1987 - 1996 F150 & Larger F-Series Trucks1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks
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Here issues it run great next day when turn off then start it run ok but when hit pothole or stop. It will idle high plus transmission refused shift 3 or 4 gears it just stay 2 gears until it slipping then BANG in 3 gear like you have nitrous in engine.
When we open hood and wiggle wiring harness from driver fender to engine it kind random it work back normal then few sec it went back high idle.
When we bought that truck first day we fill tank and drove home then around town. Mpg was 15.
Now I can't get 15 mpg anymore without random high idle and transmission won't shift correct. I get 9 or less mpg.
Battery light on dashboard finally gone it was bad connector contact on alternator.
Sorry for my bad grammar.
Currently drive 2000 f350 7.3L XL 4wd auto. mpg vary 15-17.
1999 F250 5.4L 2wd 5.4L auto with over 246K miles. Got used 5.4L with 100K miles. Need find motivation to install 5.4L.
You may have a bad TPS but it alone would not do this.
Other things it could be are:
A bad ground wire either in the wiring from the PCM to the TPS or a bad PCM ground wire at the radiator support where the small black wire from the NEG Post of the Battery hooks to the body.
A bad 5 Volt supply in the PCM but not as likely.
Bad pins in the PCM or TPS plugs.
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