2011 f150 throttle body
 

I have a 2011 f150 5.0 I've sent though 3 throttle body's the stock one and 2 90 mm throttle body's all 3 have gotten stuck closed and I have taken it to reedy Ford and they say nothing is wrong all 3 throttle body's when they get stuck closed they strip like 3 to 4 teeth off the middle gear sometimes my truck will jump like I'm pressing the peddle on off on off do you have any suggestions any help is appreciated