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Water in engine-head gasket most likely.
That isn't likely. Most head gasket failures are caused by overheating. Not changing the oil will cause the motor to sludge up and increase the wear on the internal parts.
possibly a bad head gasket you might need more coolant
nissan primera overheating after changing the water pump and radiator what could be the cause of this
You have a blown head gasket.
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If a car is sputtering at high RPMs, the fuel pressure needs to be checked. If the fuel pump can't keep up, this will cause sputtering. Also, the car should be checked to make sure the valves are adjusted properly.
wheel barings
Someone didn't hook the wires up right.
Something was assembled improperly. Double check all work.
The Intake gasket is leaking, NOT THE HEAD GASKET. Replace the intake gasket
Replacing the timing belt on an Interference engine, and doing it wrong, can cause serious problems. Busted piston, bent valve, cracked head, are a few.