No luck with the O2 sensor. No difference at all.
Next up was the EGR valve and it now appears to be running better than ever on idle, the state of the old valve would also confirm this needed a change.
Ran the car for 20 miles without issue. Last test was to throw a sudden drop in revs to see how the car coped (this would cause it to cut out when the issue started)
Got up to speed (empty road) dipped the clutch and took it out of gear and sure enough the sudden dip in revs caused the car to cut out.
It feels as though the sudden drop cuts the voltage in the car. Started back up, came to a stop and it had a rough idle again for about 2 minutes and then settled back to perfect running again.
Any suggestions on how to cure this?
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