How do i replace the throttle body linkage bushing

First step is to see what error codes (DTCs) are present using a code reader.

unit has shift linkage between throttle and transmission linkage, it has plastic bushings that hold it in place, they will get brittle with time and break, allowing linkage to come off or be out of adjustment. Have whoever rebuilt it have a look at them and replace them. There plastic, cost should be a few dollars.

The throttle body on those carburetors does NOT use a bushing for the throttle shaft. They are single-use only, and not serviced separately. You may be able to find a replacement throttle body, as they were available in their parts system at one point, but that was decades ago.

ENGINE OIL + FILTER CHANGE.LUBRICATE CHASSIS SUSPENSION AND STEERING LINKAGE - LUBRICATE TRANSAXLE SHIFT LINKAGE AND PARKING BRAKE CABLE GUIDES - LUBRICATE UNDERBODY CONTACT POINTS AND LINKAGE - SERVICE/ INSPECT DRIVE SHAFT BOOTS SUSPENSION BUSHINGS + BALL JOINT SEALS. SERVICE/INSPECT EXHAUST SYSTEM + THROTTLE LINKAGE.ROTATE TIRES.SERVICE/INSPECT BRAKE HOSE + BRAKE LINING.REPLACE AIR FILTER ELEMENT.REPLACE SPARK PLUGS IF YOU HAVE PLATINUM PLUGS REPLACE THEM AT 100000 MILES.SERVICE/ INSPECT - AUTOMATIC TRANSMISSION FLUID AND FILTER.ALSO SERVICE/INSPECT IGNITION CABLES + FUEL SYSTEMS AND VACUUM LINES / HOSES.

Check transmission cable at throttle body, it is a braided wire on the body linkage, pull on it with your fingers it should be spring loaded and pull back . If not replace.

Most transmission shifter ( where you shift) has a linkage control to shift gears in the transmission. Those joints from the linkage have bushings made of rubber. Once these rubbers were worn down and torn, the noise from metal friction from linkage can give you that intermittent noise. When the gap from the linkage joint enlarges in lieu of the bushing space, it causing the engagement of shifting is off from original position that was why you are experiencing "binding in other gears"
Have a different shop to check out these linkage control bushings and replace them. The bushings are cheap and it probably takes about 2 hours the most to replace them. This will save you a lot of money on spending on unnecessary repair. Good Luck.

I had the same thing happen to my 2001. I Got a good stiff close hanger (metal) and made my own clasp. It cost me nothing and It's been working for over two years now. Take that Ford! $400 to fix it Ford, give me a break!!!

FIrst you need to find out why your throttle is binding at WOT before you pay for a mechanic $85.00 an hour that you can do you self. If you have floor mats, make sure that it's not bunched up by the accelerator peddle causing the it to bind to the floor. If you do not have floor mats, work your way from the peddle to the cable and see if there are any worn parts from the peddle to the firewall. Also inspect the cable and the bushing at the firewall where the cable goes through the firewall, once out to the engine bay, follow the cable to the throttle body and look for any binding to the cable. Move the throttle to the WOT position and see if the cable is binding or the throttle body it self is binding. If the cable is worn or binding, replace the cable assembly from the accelerator peddle to the throttle body. If it's the throttle body, your going to have to replace that since it's cheaper then repairing and you have new parts. Good luck and keep me posted be glad to help you save some money. 

I honestly don't see how changing the computer could cause this - I would first suspect a broken return spring on the throttle body. With the engine off, trace the gas pedal's linkage (or cable) back to the point where it attaches to the engine (throttle body or carbuerator if not fuel-injected). There will be a shaft it attaches to on the throttle body (or carb). Disconnect the linkage at this point and try to rotate this by hand, it should snap back when released. If it does, you probably have a 'frozen' cable which needs replaced. Don't forget to replace the linkage where you removed it now. If it doesn't, look for a 'missing spring' on the throttle body's side or any place the linkage appears bent or could 'snag' on anything. If the attachment point doesn't rotate smoothly or 'binds', or kind of 'wobbles' in it's holes the shaft bushings need replaced or the shaft is bent and needs rebuilt. While your'e there, regardless, you should take some 3-in-1 oil and lightly lubricate any points where the shaft, cable, or linkages touch any other part.

Maybe the stick in the transmission is broken.