Nightmare starting again

My Cabrio with 2,0 abf lump on k,jet system   started being silly again today only after 30/40 mins running.   Loses power holds back like mad then takes off like rocket.  As keep driving gets worse not even rev at all just splutters on.
Switch off restart goes OK for 5 mins then starts again  Things done new fuel pumps tank and external and fuel lines plugs and leads rotor, and cap removed ecu but back vacuum advance retarded
Even rewired everything still same fuel pumps coil etc   now thinking got be on fuel pressure or warm up reg
It's going get dirty diesel this rate

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have a read thru my 16v guide, though if you deleted the ecu and isv then some of it wont apply any more, juist look at the basic sections:
http://www.clubgti.com/showthread.php?195423

Mine is very basic now   No idle control valves or any thing else
I'm thinking would warm up reg. cause any problems or fuel accumulater
As these never being changed so they be prob 20yr old


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Just strange switching car off so loses fuel pressure  then goes ok for bit once started up again. Slow gets worse after few mins but only after about 45 mins running


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need a pressure gauge on it really to see how the wur is working, if you look in my signature link ive a few kjet manuals that cover bits and bobs, plus the wur guide shows the pressure gauges and check and adjustment of the system/control pressure
http://www.clubgti.com/showthread.php?81658