93 taurus problems

i got a 93 taurus, 3.0 engine, GL... i have the CEL on and went to auto zone and got the free check engine light test: 25 Knock sensor, was told that i dont have one, i checked the car and
cannot find it???? 34 EVP voltage out of range.. i took the sensor off and brought it to auto and they tested it with pressure to the sensor and says it is good. 51 ECT sensor.. i checked it with engine cold and got a zero and open signal so i guess this is correct and with the probles on the sensor at hot engine i get 3.5 ohms at 20,000 ohms range.... is this correct or is it defective???? i also pulled the small vacuum hose off the EGR and let the engine idle which seemed ok for and idle and then pulled a vacuun on it and then the engine stumbled(i think it is suppose to do this???)... any ideas would be apprecitaed...the engine light comes and goes as it pleases.... thanks for a reply.. if this message is repeated please excuse as i had trouble with the newsgroup programs for the past two weeks..... and tried to send it several times....

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