Stalling Engine after long drive
 

Hi,

Recently I noticed that my car after long drive specially with AC ON starts stalling some times turned off and some time RPM try to controls it self, while all this happening I see oil pressure sign ON with Low oil pressure sign for a second.
Rest car runs smoothly.

My PCV oil trap is clogged and last time while changing oil I see some small parts of silts in oil.

Will surly appreciate cure ideas.