I've got a vaccum leak somewhere near the distributor but can't locate it. Does anyone know what could possibly be leaking under the runners. I'd like to find out before taking things apart for no reason. The car was also throwing these codes:
12 - no reference pulse to ecm
22 - low voltage to the tps
33 - high voltage ( low vaccum) at mass air flow sensor
I figure the last code goes along with the vaccum leak im hearing near the back of the engine.

If anyone has any ideas or have had similar experiences let me know.

 

some tricks i picked up when looking for a vaccume leak while in my highschool autoshop ( teacher was a diehard morpar guy and knew his stuff)

get a propane tourch turn on the gas and start going in there area you think the leak is and follow the vaccume lines if the idle calms down or raise or lower youy found your leak

no gas use break cleaner or soap water and listen for the idle to change again

also did you check the vaccume advance on the distributor the plastic lines on mine were cracked and it took me forever to find it