hey everyone any help would be great. was driving down hwy to work and noticed a ticking noise, pushed in the clutch to downshift for tollbooth, and it dies, tied turning over will rolling and nothing, tried to pop start and nothing, pulled on to shoulder and turned key off and back on and it started right up but with the worst noise i have ever heard come from a engine. like nails on a chalkboard. put a quart of lucas in it and tried again and much better just mainly a moderate valve knock. any ideas