[tfoti]

spark plugs??? start simple!!!! my car did the same thing when flooring it. it coughed, hesitated, jerked. and it was a stupid spark plug. the spark plug was only 4,000 miles old and it the electrode was green from corrosion. just try it...unless you already have? fuel filter?? clogged injectors if you run on empty alot. air filter??

another thing i forgot to add is that if it wont pass emissions it could be the oxygen sensor. thats what causes most cars not to pass it. i live in upstate NY and we dont have to pass emissions so i've never had to worry about it before.