Thanks guys,
I have some valve cleaner on order so will be running that through the tank to see if it helps and as a preventive measure anyhow.

Regarding the coils, does anyone have any info on how to test these if possible? I recall on oil oil-filled coils you could test for resistance etc, but not sure about these solid coils.

Also tested FP reg and EGR Vac line per Arthur, both are fine.

Thanks

__________________
Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)