60's. California weather. Im wondering if my timing has anything to do with it? Or a faulted sensor? I replaced all the gaskets torqued everything. had the heads resurfaced and checked for cracks/leaks. It all looks good. No leaks on the outside. Someone also told me to look into the egr valve. Im definetly on uncharted territory and like I said in my other posts, I needed this truck running last month.