Possible ignition module problem

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Well tonight someone mentioned that if i was able to get it to bog down while in park, that if when i had it bogged down that if i sprayed extra fuel into the TBI that if the RPM came up then I have a fuel problem if not it is a ignition problem.
Well i was able to get the motor to bog down while in park and when i sprayed the TBI with extra fuel the RPM did nothing and the motor stayed bogged down.
can a map sensor test good electrically with a vacuum pump and a meter but still be bad in actual use.