aCNDerivative

Hi guys, Having a nightmare with my 51 reg Lupo E type at the moment. Just had to replace the pedalbox and cracked engine cylinder... Now I've got a problem with getting the car to start when the engine is cold. The EPC light will normally come on when the ignition is started and the car makes a very odd rattling noise. Most of the time it will also be limited to 2000 revs, when it isn't and I stop revving the engine the car will (or almost will) totally cut out until the engine has warmed up at which point it runs like a dream; no rattling noise and no problems. EPC light also goes off. Already cleaned the old throttle body and that made no difference. Bought a refurbed replacement, cleaned that but no difference. Any ideas?