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they say it reprograms air/fule ratio and adds 50 hp and 8 mpg tryin find out if it works or not Jeep Grand Cherokee

I bought in ohio hauled it all the way down here it would crank over but no start so put a new crankshift position sensor the same crank no start it aint gittin no fire so went and got a jy coil pack witch was an extream pia and now I goin to take it to a mechanic hopin someone could...