If you remove plugs , do a compression ck . This will identify or eliminate poor rings or a cylinder/piston related problem . Remember , only remove one plug per cyl .
Another suspect would be a PCV problem however the engine does not have a PCV valve --- it operates via holes in the intake manifold covers ---- possibly you could have plugged them sealing w/ RTV . Should be able to check this removing the top cover exposing the hoses & check for free flow back thru the covers.
Here is a portion of a post addressing this subject
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Old 03-30-2015, 07:33 AM

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Default Re: Vacuum leak, high LTFT, pcv hissing, HELP!!!
There is actually NO PVC as you are accustomed to on an American car, on this engine it is merely a couple of small holes in each valve cover that has a hose running to a point just in front of the throttle body on a "Y" connection.
The larger hose on the drivers side is the equalization vent hose that connects BEFORE the throttle body.
Check the hose going to the brake booster and the one going to the purge solenoid on the drivers fender well.
There is also a vacuum connection on the manifold itself ( not sure if front or rear ) that is not easily accessible that has caused issues with decayed hoses.
Word is that the intake manifold has to be removed to address this.



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