Well after excesive negative fuel trims have reappeared on my 278k mile V6 Crosstour and positive results of a compression test, I have so far replaced throttle body, injectors and fuel pump. I will today, begin the teardown to replace the lower intake manifolds (Honda terminology.. Injector Base) and gaskets in hopes of solving any unmeteted air that may be entering the engine this way. I have been unable to find any vacuum leak. I'm leaning this way because it wasn't a problem before I removed plenum. The plenum does not lay flush on the injector bases before tighteing it down. Need to find torque specs for these Injector Base bolts. Torquing while heads are mounted on the engine looks difficult. Dunno if possible. Anyone been here?