P38A irratic idle overfuelling

Hi everybody
I have not posted for a while my p38 has been on SORN drove it for the first time yesterday first 40 miles it was great then seemed to go to limp mode and seems to be overfuelling your thoughts would be very welcome

Diagnostics required.

MAF, plugs, leads, blocked fuel filter, fuel gone off,air filter. The list goes on.
Give it a top to bottom service of all oils and filters, new plugs and leads and clean out all the inlet tract.
If it's still playing up, post back with the exact symptoms and you will get plenty of advice.