Mekanik

Thanks. Do people ever just complain of a intermitent drivability? Like for instance a truck that only misfires when towing or under a heavy load?

What is the best way to diag. a leaking headgasket and egr cooler. Is the best way to follow the tsb, monitoring coolant system pressure, removing the egr valve, and pressure testing the cooling system with the front end down on the ground? Does the co2 tester method seem to work well? What about an intermitent leak like only when the truck is towing? All information will be appriceated. Thanks