Hi my Rav is 1.8 vvti and was running fine until yesterday, over here we have a n, c,t, test like the English mot, anyway I put a bottle of dipetane, fuel additive intoy car to pass emissions test, and since putting it in my petrol tank the car has smoked constantly when I give it stick, and if I leave it ticking over it smokes worse, any advice as my test is on st paddys day Tuesday, and I think I'm going to fail,