1.4 throttle body

hello I. Been having a problem with my 2001 k11 misfireing and loosing power the car goes all jittery. I have replaced the coil packs, spark plugs, injectors, maf sensor and fuel filter? I have been advised it may be the throttle body or the sensor attatched to, the sensor I cannot seem to get off? As for a replacement throttlebody, Impossible to find a replacement. Is there any other I can put onto it?
 
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