hello i had put a fuel additive to my mercedes 260e 1989 the product was "seafoam" since i added it my car it will not run it will start and idel ok but when i put it in drive and give it gas nothing happens i can floor the gas and the rpms do not go up but just a small amount and then the car dies. i have replaced the plugs and fuel filter but nothing has seemed to help. could someone please help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!