If the problem is on light throttle, it's unlikely to be fuel filter blocked.
The 2 that seem most likely to me:
1. - problem with power feed to fuel pump via resistor which is switched by 'fuel pump relay'. Check for this by linking FP to B+ in diagnostic connector as above.
2. Knowing the car has been stood (presumably unpowered) for 5 years, have a look at the following thread about capacitor failure in ECU's. The thread covers gen 5, but I have heard of a couple of gen 6 ECU's with problems with capacitors leaking. The ECU is located under the dash, behind the centre console, bolted to the transmission tunnel. Access by pulling back the footwell carpet on both sides (connectors on passenger side, fixing bolts on both).
viewtopic.php?f=2&t=5617It is also worth checking fault codes. No special equipment needed, follow the guide on the following link.
http://www.gt4dc.co.uk/info/howto/ecu/e ... _codes.htm
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