I've been having a problem with my engine over the last couple of weeks.
When the engine gets hot and its idling, it only runs on 3 cylinders, with unburnt fuel pouring out of the exhaust.
After revving it a few times it fires on all 4.
I changed all the plugs, leads and distributor cap.
It ran fine for about a week, and then it started playing up again, but not as bad.
I took one lead off at a time, and found the 3rd cylinder back was the problem.
When I took the lead off it, it made no difference whatsoever.
I changed the lead with the old one and it ran fine again.
Another week later, its running rough again. Could it be the old lead is breaking down?
It only happens when the engine is hot. It's getting fuel, its all going out the exhaust.
Any ideas would be much appreciated.