Quote Originally Posted by Tech5
hey anything can be the cause....I think its his brakes lol

But yes I have seen that too...But going by how he said its running great at above idle I don't think thats his problem..Sounds more like tune up issue...But who knows could be his brakes
That's the thing, the Civic ran fine as long as your foot was on the gas so the last thing I'd think it was the cat.