Re: rough running at high engine speeds

Posted by prentice672 On 2017/10/24 14:54:36

I checked the manifold heat riser valve and it moves freely. I did consider the possibility that an internal piece of the muffler could be jammed in such a way that it restricts the flow, but I have no way of testing that hypothesis, short of removing the muffler. And I'm sure it's probably rusted on to the exhaust pipes so it would have to be a job for a muffler shop. It may come to that I suppose.