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i know its not a bronco but i am hoping someone can help me.

my friend has a 94 ford ranger,4.0,5 speed and when you push the gas pedal to the floor it bogs down, but if you let up off the throttle a little bit it is fine. it doesnt matter what gear its in (it does it in neutral too) it also doesnt matter if the engine is cold or hot. he tried to pull the codes but got no codes.
does anyone know what could be wrong with his truck? i am guessing tps but not sure. does anyone have any suggestions?
thanks in advance
 

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test, don't guess. dont be replacing stuff without knowing if it was bad. get your book out and your multi meter and start testing sensor values. test how much vacuum it is pulling, see if the oxygen sensor is saying its running lean or rich, lots of tests can be done...
 
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