Please do not replace random parts. Your costing yourself money for no reason.
Is the unit calling to run?
Is the unit calling to run?
Sounds like something is wired incorrectly.As a rule, the first thing to come on is the inducer motor. If the pressure switch senses adequate airflow, the gas valve then opens and then the blower motor comes on. You say the blower motor is coming on without the inducer motor running? Something is amiss.