92 f-150 5.0 high idle

The TPS may need replacing but, I do not think it is your problem. Very high idle as you describe is usually a big time vacuum leak. That vintage sometimes had a problem with the upper intake gasket assuming that noone has screwed around with the idle stop or something like that. If you have have mechanical skills equivilant your ability to find the TPS, this will be a job to be farmed out. If you E4OD trans needs an overhaul or replacement, your '92 F150 is probably not worth repairing. With a bad trans and a spastic engine, you have a $300 truck. After you spend a couple grand to get it operational, you will have a $1500 truck. You can search google for Ford EEC IV codes to find instructions and pictures of how to get the fault codes. Your next problem wil be finding the EEC IV diagnostic connector over the left fender in the engine compartment.

Good luck

Lugnut

Check for vacuum leaks. Not just in hoses and fitting. Devices that use vacuum can leak too. I recommend using a MityVac to check for leaks.

You might want to pass this 411 along to the OP. Mine is doing just fine.

Lugnut

whats a mityvac and where would i get one ? also i held my hands over the intake so that it couldnt get any air and all it did was drop the rpm to about 1grand it should of stalled out right i know it couldnt get any air cause it sucked my hands in tight where else could it be getting air from?please help

The MightyVac is a hand operated vacuum pump kit for testing components. If I were you, I would start with a can of carb cleaner or WD40 to spray around the suspected leak points while the engine is running. When the engines changes while you are spraying, you will have found a leak. Some folks will tell you to use starting fluid (ether). Do not do this as it can be very destructive of the engine if you hit a large leak and it is highly combustible or, even explosive.

Lugnut

Unlike the WD40 method, it allows you to test vacuum components, and doesn't put crap all over your engine that you will have to clean off. They are readily available at auto parts atores. You can also use it to bleed your brakes, however if you are going to do that I only recommend that you use it to drain your brake fluid reservior then refill with new before bleeding the regular way (speeds up whole process greatly).