Your fuel distributor is under your air cleaner. It is the device that all the individual fuel injector lines run to/from.

Bleeding fuel lines is dangerous in that raw fuel will come out. If you don't know how or feel it is something over your head, have someone else do it.

Injectors can be removed and checked with a proper injector testing stand. It supplies the proper amount of pressure and also allows one to observe correct spray pattern.

Have you tried the old two bottles of Techron Fuel Injector Cleaner in less than a full tank of fuel? This is a simple and cheap way to try cleaning them out.

Old on spark plug threads? That unto itself isn't a problem. It probably indicates your valve cover gasket is leaking.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)