[Old Guy with 87 GT]

yes they can be adjusted,the two screws fastening it can be loosened and it has a little play in it.......

the stock setting for the tps is a little lower voltage ........i'm not sure but i think the stock guidlines to tell you if the tps is good is like .75 to 1.0 volts .......

seting it at .98 is like a performance trick and thats the setting most guy's use...........if the voltage is around there then chances are it's not your problem

if you find that when you adjust it ,you can't get it to .98 ,then you can take a drill and elongate the holes a little to give the tps a little more adjustment room.....i just replaced mine and had to do this to get .98 .........when i set up my idle took a couple of times to get it to idle where i wanted it ..........you have to set the throttle stop ,then adjust tps .......when i did mine i adjusted the throttle stop to get the idle where i wanted it then went back and set tps

unless somone cranked up the thottle stop screw to compensate for another problem,you shouldn't have to reset it ........the air control valve (cylinder on side of throttle body) basicly controls idle ,it does this by adjusting the amount of air going in ,the computer alows a set amount of air and then adjusts injectors to find the right mix ........if the thottle stop is set to high then to much air will enter thottle body and the computer will compensate by setting the air- fuel to what air it has to work with..........so basicly if you turn that thottle stop screw up it lets to much air in via the main ventura and the computer can't control idle with the control vale ,it'll close the valve and and there will still be to much air going in moter..........if you have a vacuum leak of if the idle control valve is gumed up and can't close all the way...it'll cause the same problem...........

illiminating the the tps as the problem is just a matter of checking to see if it's voltage output is well above normal.........the tps tells the computer where the gas pedal is at ,if it puts out to much voltage the computer will compensate by thinking that your pushing the gas pedal down some and the carts not at idle

#1--if you check the voltage at the tps and it's not out of range by a large margin ,#2--then check the idle control valve make sure it's closing all the way (take it apart clean it out ),#3-- check to see if the set screw is holding the main butterfly open too much (turn set position to close it more,see if it changes idle )#4--check for vacuum leaks ..........if your idle is still high after illiminating all the above then another sencor must be giving the incorrect readings making the computer think runnings conditions are wrong

well good luck ,hope i was able to help