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93 4.0L Explorer 100015K miles.. recently on start up when cold, blows oily residue out the exhaust pipe and makes about a 18 inch by 4 inch eliptical spot on the driveway. Engine idles porly when cold, runs fine when it warms up. new plugs, IAC, fuel pressure regulator, all vac hoses checked...

need help with vaccum tree connections over PCV valve. one on front is plugged, one has connector on back one is open. looks as if something is missing. car runs with either rear port connected as long as the other is plugged. Is there a specific way to connect the lines ?

engine starts easily, runs very rough, shuts off, only way to keep running is to play with accelerator and try to keep idle over 1200 rpm. engine check lite comes on immediately sometimes, other times after 3 or 4 miles. black condensation comes out of tailpipe only when you start car when cold...