Hi guys not sure if I can post this here, if not please delete, my daily celica started screwing up about a week ago, was driving along normal then a large drop in power for about 3 seconds then normal, pulled over and found a vacuum leak coming from a plug on the inlet manifold, changed it, but issues remain and are getting progressively worse, now every time I drive it will randomly start feeling like its about to loose power but doesn't, other times it will, stop at lights occasionally and the revs will drop from 1200 to 200 for a few secs not stall then raise to 2000+ and sit for round 5 secs then back to normal, did have a small pod on the rocker cover as the breather instead of sending back into the intake for a while now checked that and had a fair amount of oil over it so ditched it and connected it back into the throttle boddy, any body got any ideas????

If that breather had oil on it, sounds like a bad vacuum case as it should not have any oil in it.

i would check to see your cam cover is not leaking oil, check spark plug might has gone and causing one plug to drown in oil hence lose power sometime.
 

Does it run an AFM? When this played up on the car t was causing random loss of power etc.

Cheers