This could be one of the rare moments where a mechanic you go to carries out a diagnosis that is actually correct
Other often times they might take you for a $2,000 ride changing all of your sensors in your engine, whereas they have actually spent five minutes looking before firing the parts cannon as they say
Anyhow, I can make a new engine wiring harness complete ready to plug and play
First make sure to check water inside the distributor cap as Captain mentioned