mattressking
10 digits to freedom
Plug inspection is the best way aside from a wideband. Best to learn how to read plugs as a wideband won't tell you anything aside from air fuel mixture. Compression test is the easiest method to analyze engine health. Wet/dry test along with plug reading will show you how its oerating. Aside from that, clean all coolant hoses well and drive the truck. If there are dried up marks or wet spots, you'll know its leaking post-cleaning. Make sure to run heat at high through front and rear to make sure everything is circulating as there can be weaknesses there as well.