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My car is idling a little off and it is showing code P1624 along with PO300-304 misfire in all cylinders. when it gets warm it sounds fine but my needle is trying to climb quicker than usual but it is not overheating. (temperaure) What can be causing this? Earlier the code was P1614 but now it has changed to P1624??????

Vehicle: 1997 Kia Sportage 2.0

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P1614 Mil request circuit high voltage

P1614 means you have a bad connection, The ECM needs proper ground to operate properly,P1624 this is the TCM (transmission control module) signal to ECM. Inspect for proper ground especailly at the ECM,start at the battery negative to body and engine grounds, As for the temperature climbing quick coolant leaks,faulty thermostat,and the cooling fan being non operational,As for the misfire a faulty coil or even the sparkplug cable or sparkplug, will cause the misfire.

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