Knock sensor

Code 43. 1995 chevy K1500 w/t originally had a 4.3l engine with standard trans. Now has a 5.7 l with standard trans.The current knock sensor goes directly to the ecm which is the same for both the 4.3 and 5.7 but probably has the 4.3 prom in it. Knock sensor shows 100K ohms but book says it should be less then 10K ohms. Could it just have the wrong knock sensor in it? And could that cause the truck to stall on stopping when the AC is on. Also, the speed sensor on trans could be bad as speedometer isn't working and the instrument cluster has been replaced.

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