engine just stops!! HELP!!!!

ok so i first noticed this at beachport driving on the sand dunes about 2 or so months ago lil jimny cricket is a little down on power and when he cops a bit of a hiding he decided to call it quits and all of a sudden the engine will just loose all power and stop dead wee out a bit of oil and after i leave it sit for a little i can turn it over and it starts first hit but try and start it after it cracks them straight away and it will fire but wont go also if you have been driving for a while and stop and leave it running it will do the same thing but temp gauge reads good so i figured it could be dodgy so i replaced it with a new one still does it im thinking it might be oil pressure?? duno also it is a g16b not a g13b it got a transplant a while back HELP IS NICE so please gime some advice so i can have my reliable old zook on the road also it has been a bit hungry on fuel lately ma be fuel pump??? hhhhmmmmm

any one??

Where you say it wees out a bit of oil from where ???? breather exaust ????

Never noticed any oil coming out of mine but when a similar thing happened to me it was the throttle body had never been cleaned in its life and when the snorkle was fitted it easy sealed up properly, I cleaned it out with a can of pb blaster (there is proper cleaner) or u can buy Subaru gum cleaner stuff which you start your car and spray down air intake untill it stalls the leave it for a few hours then keep turning over engine untill it starts

Looks to be a dump pipe near the top of the gearbox also not to complain about advice but I think that throttle body cleaner would be very bad for your engine like squirting carby cleaner down there it would free up the system but dump all the shit into the engine just a personal opinion thanks for the help will hopefully be fixed soon

Take the trottle body off and do it its as simple as that and makes sence then nothing goes in the engine also check the cam sensor and crank sensor if it has one