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2009 550 idles too low and hard to start. I’ve replaced fuel pump, injector and spark plug. I’m now at the Throttle Position Sensor and on the circuit from the ECU I’m only getting 4.2 volts vs the 5.0 spec. M getting 5 volts on the other side of the TPS plug in spec. I jumped the wire directly from the ECU to the TPS plug and there’s no short I the wiring still 4.2. Anyone have any ideas? New ECU? Prowler has 4500 miles on it.
 
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