Truck trouble! and I'm car illiterate! :(?

It sounds like you might have a cracked head or head gasket. This would happen if you let your engine get to hot. If no water leaks visible, and you smell antifreeze, then you are burning it in your engine. Same problem I have with my Honda. If the smell smells like sulfur or rotten eggs, then your cadilatic converter is stopping up. Engine RPM's running up good be a number of things, check your vacuum hoses and pcv valve. and check your fuel pressure, You can get the pressure checker at Auto Zones or Advanced Auto Parts, for a payment you get back when you return it.