Its 150 for the diag cause they took time in their life to learn these things as their career just like when you go to the doctor for them to tell you eat healthy and take this medacine is for their knoledge and for a person that doesnt know these things then they take it to somone who can figure it out cause its not always a simple diag. You could also have a hole in the intake manifold at the bottom or the back that youll never be able to see and tbh some mechanics even might miss and try to relearn the throttle body
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Its 150 for the diag cause they took time in their life to learn these things as their career just like when you go to the doctor for them to tell you eat healthy and take this medacine is for their knoledge and for a person that doesnt know these things then they take it to somone who can figure it out cause its not always a simple diag. You could also have a hole in the intake manifold at the bottom or the back that youll never be able to see and tbh some mechanics even might miss and try to relearn the throttle body