I need an engine diagram for a 1999 Lincoln Navigator?

There are a lot of engine diagrams on Google, just make sure you use the correct trim package. This sounds like plugged exhaust. But it is a 1999 so there is a lot of stuff it can be. Write down all the codes then do a hard reset to clear them and then see what codes come back.

Thank you so much for your response. But how do I do a hard reset? I can't find an actual diagram that tells me what each thing under the hood is.

https://www.troublecodes.net/pcodes/ To do a hard reset: disconnect the negative battery terminal from the battery, turn on the headlight switch for 30 seconds, turn off the headlight switch, reconnect the battery. System is now reset to factory specs. Now doing this will erase any presets, so your clock and radio and anything else electronic will be reset. On some Fords products you might loose your personal unlock codes but not all. This vehicle is too old to worry about any BCM problems so you won’t need a memory saver tool.

Site error

If you can’t find the right diagram on Google then try a Ford/Lincoln forum or the reference section of you local library.

Site still having issues

You can't see the codes I posted? I just went out and sprayed carb cleaner around all the hoses and it idled down on the pictures I've attached.

I can only post one picture at a time. This next one is supposed to have two hoses hooked to it that were lying loose. I couldn't get them on so I plugged both of them with bolts.. Gonna see if that helps.

Hoses..