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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.
Check the engine ventilation system (some models use a PCV valve) and see if the valve is stuck closed or if there is a collapsed hose for the venting system causing this here needing repaired or replaced.This can cause this type of fault here.If this has already been checked and found to be o.k. let me know so we can continue.
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The only other thing I can think of here that can cause this is an issue with compression leaking past the valves or past the piston rings causing pressure in the crank case.This is usually the cause for a problem like this here when the venting is working properly.