In a slight predicament. 2005 impreza wrx. I've done plugs, swapped coils, swapped injectors and compression tested cylinders. Cylinders ran about 148 all the way through none look to have low compression. Replaced coils with some NGK platniums, old plugs didn't look bad at all. Im not too sure what to look for next, possible vacuum leak? Some help would be greatly appreciated!