car has been down on power and around 5-6 mpg worse lately, thought it was bad fuel but after using different station made no difference, 2 months ago i replaced injectors as 2 were misfiring getting fuel cuts, car was running like a dream until last week, no eml, i did add the rs4 return valve as i was planning to go loba, im wondering if somehow the extra rail pressure is messing with things, but i dont see how thats possible when it ran fine for over a month?
any ideas, chave checked dv, done the dipstick test with pcv checked hoses,
even when its off boost its lost mpg and performance, so im rulling out boost leak,
