It ran good then i installed new heater core, now wont stay running, fires but just for a few seconds.
My car has 200000 miles.
My car has an automatic transmission.
The heater core is not an essential component that controls operation of the engine. However, it’s possible that during your removal and replacement service, that an electrical harness leading to a critical components; such as a EGR valve, mass air flow sensor or other item was not correctly reattached. It’s also possible that a vacuum line is loose; which typically will allow a vehicle to start then stall. You might want to have a professional mobile mechanic complete a car is hard to start inspection if you can’t find the problem by checking the above components.
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