Hi,
Based on your description, it sounds like the crankshaft position sensor is going bad, It may have been damaged when the pump was replaced or even from a leak from the water pump.
Take a look through this link and let me know if it seems to mirror what you are experiencing:
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
Also, if you haven't already, the computer should be scanned to see if there are diagnostic trouble codes that will point us in the right direction. Take a look at this video and let me know if it is something you can do or have done:
https://youtu.be/InIlnsjOVFA
Let me know your thoughts on the sensor link.
Take care,
Joe
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Wednesday, October 21st, 2020 AT 6:46 PM