i need help asap, got a 95 import wrx and for the last week my car has had problems starting from cold, the revs would usually fly up to 1500 rpm but now only sit at about 200 and the oil light stays on, this last about 5 seconds then the light goes off and the revs fly up to 1500 like normal, this only happens when cold!!! Also jus noticed my water is looking a nasty brown colour, but it had rad weld put in about 6 months ago and thought this would cause the colour.

Just had new 02 sensor fitted, coils seems fine, fuel system been flushed through, has plenty off oil (that also looks fine) and not losing hardly any water.

please help its driving me mad