strange bouncy idle + air hissing sound
 

so i have a 2004 rx8 with about 140000km
my coils and plugs are currently around 20000km on them

problem:

my car was driving perfect, no loss of power, no problems at idle, no problems on hot or cold starts, but then

i recently got my oil changed at mr lube and as soon as i turned my car on my idle was bouncing between 7000-1600, im not very mechanically inclined and thought to myself it was somehow oil related and would correct itself

but 3 days later and the idle is still bouncy and when my car is running i hear an air hissing sound from somewhere near my oil filler cap. the car doesnt die at idle, but it is rough and bouncy, but it still starts and drives without power loss.

any ideas what the issue is?

i just want to know if theres anything that the technician at mr lube could have knocked or disconnected, because it was driving perfect until the oil change

It sounds like a vac leak. There are several vac hoses close to the oil filter that might be knocked off when changine the filter.

Look at the VFAD nipple(to the bottom right of the throttle body). And the line on the back of the intake manifold that goes to the vacuum chamber.

Try this thread for help.

https://www.rx8club.com/series-i-tec...rouble-177057/