have high air flow from the breather line placed on the head cover and i found some oil inside the intake manifold duct, and when i open the oil cap during engine running oil vapor and small oil droplets came out, is this normal or i have problem? my engine is B16A2

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Is there air pressure blowing out when you take the oil cap off.

 

If the vapor is excessive, there is a problem. Otherwise, it is normal crankcase pressure caused by the movement of the rotating assembly.

Typically, it is perfectly normal to see a bunch of oily/greasy build up in the intake manifold because vacuum pressure causes those oil vapors to be sucked into the engine and harmlessly burned.

 

yes theres a pressure when i open the cap

 

Compression is leaking past the rings somehow into the crankcase causing that pressure. You should perform a leakdown and compression test to see if your rings are the culprit.