I just experienced the intake manifold leak on a 94 explorer. The hole was so small it wasn't evident without a pressure test. The local parts store sold me a complete gasket set for manifold, valve covers, plenuim, It did not come with injector O rings. If your parts supplier suggests new improved gaskets make sure they have the valley pan type gaskets. mark all your electrical and vacumm lines, tie the A/C compressor up towards the front. I used my hood latch, I seperated the upper and lower plenuim, I washed the injectors in hot soapy water, I ccleaned the gasket surface with a sharp razor scraper "DO NOT GOUGE THE SURFACES OF THE INTAKE". I used a brown buff disc and used a low RPM just so to clean any gasket material from the surface. I used brake clean to make sure all gasket surfaces were free of oils, I also used a very thin coat of copper RTV sealant on on the engine and the head mounting surface, I also put a little extra where the head and the engine meet. I believe the torque for the manifold was torqued to 19 Lbs.
I changed the heater hose and the molded hoses for I used 1/2 inch hose and covered the little crack of the charcoal filter. Electrical connectors are very brittle use extreme caution so they do not break, most of the connectors are no brainers just pay attention to the way they are routed. If you don't have a weep hole in your thermostat make sure you heat soak the motor and check the anti-freeze. Good luck and if you have any questions I will be happy to answer them if I can.
did not relise that when i quoted that member... the date was months ago ...@$% it ! 
