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hi, can you check at the coils to see what kind of voltage you have ?
also, check the injectors for what kind of voltage reading you get .with the key in the run position.
I am thinking since you have that low voltage at the inertia switch that the may be corrosion at the fuel pump relay and .or the ecm/power relay .
these are under the hood ,drivers side inner fender ..jazzmaster ..
have you checked these things I suggested yet ?
do you still need assistance ?