misfire / hesitation

R27#239

Paid Member
Want to get this sorted now.
For a while (I don't drive it often) my 197 has a misfire/hesitation when warm.
It was only ever so often and irregular to start, but has become regular.
For instance it is like the engine is held back and missing and then all of a sudden released.
The car also idles very lumpy, I'm aware this is usual. But since this issue arose it is worse.


Read the codes and came up with the knock sensor, which I have changed.
Help, I'm fed up now
 
Plugs, coil pack, cam sensor on the duff are all things that can cause poor running. What sort of fuel do you run the car on? Tried any injector/fuel treatments to clean a potential blocked injector? The FORTE stuff is very good.
 
Tracked it down to a very brittle and split rubber boot on the end of the coil pack. The plug was shorting to the head.