unexpected shut down

so i have a 2.7l 5-speed that shuts down while driving down the road. i was driving down the road at about 50-60 and both the battery and oil light began to flicker. when i dropped it in neutral the rpms dropped and the truck shut down. i noticed some milky/frothy oil at the top of the oil cap and at the PCV. However after the trucked had been sitting for a day i drained about a quart out of the bottom and it looked clean. i replaced the PCV valve without any luck and the problem persisted. the truck isn't overheating but i think this might be a head gasket problem. Could anyone help me out here? id like to find the true problem before i just start tearing down the engine, Thanks.

 

You may have 2 separate issues there. The part about the oil and battery light makes me think you may have a failing alternator. Combined with something else. Any engine codes?

 

^This. Alternator is done for. Small chance you have a bad pos+ cable/ connection. I wouldn't drive it until you check your connections or/& have another ALT in hand. Save yourself a tow ($$).

 

The frothy oil cap is moisture building up in the crankcase from constant short trips.

 

check your battery terminal connections before you buy the alternator

 

sorry, left out the fact there is a new battery and alternator

 

so did you check the connections?

 

^ This. And have you tested the new alternator to make sure it's supplying power? It's not common, but some aftermarket alternators can prematurely fail.

 

I had a band new alt fail in less than 500 feet of driving. 14.6v to 0v during the test drive around the block.