97 windstar 3.8
Little recent history just in case it's relevant. I was suffering very poor fuel economy, no codes. It appeared to have been caused by a split in the rubber connector between the MAF sensor and the air intake manifold so air was entering mid way. Which I have replaced along with a new MAf sensor
I am now getting oil in the air intake (air filter/MAFS) unit.
It has to be entering from the PCV system as I'm seeing oil in the vacuum pipe after I had cleaned it. So I changed the pcv valve with new gromit and checked for leaks in the pipes, cleaned the manifold and air intake system fully but this hasn't solved the issue
What should I be looking for now? Valve cover gaskets? Intake manifold gaskets?
Thank you in advance for any suggestions.