I had one of these issues way back and I found an issue I want to share.
There is a connector on each valve cover gasket that connects the injectors and glow plugs to the main engine harness. Those plugs, one on each valve cover, get corroded and dirty with debris making intermittent or bad connections.
Check those connectors for any corrosion, damaged or bent pins. You may end up replacing the valve cover gaskets to resolve this.
Sunday, August 4th, 2019 AT 5:33 AM