Ok so I'm having a problem with my prelude I just swapped an f20b into it and every thing went smooth it has obd 1 injectors and an obd1 ecu and harness there are two sensors that arnt hooked up yet they are the o2 sensor and the oil pressure sensor. When ever I start the car it revs to 8k then dies back down then reves to 8k again. Any idea on what the problem is?
Thanks

 

The oil pressure sensor just turns on when there is low oil pressure, shouldnt affect idle at all.

Not having the o2 sensor plugged in will just run the ecu in a certain ecu mode, forget if its open of closed loop.

Your issue lies else where.

 

Vacuum leak? Thats odd.