Not had the time or inclination to work on it recently to be honest.
I think it's a ****e map ( early ktec LPT ) on wrong injectors. That or a dodgy lambda.
Failing that its getting broken.
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For anyone still reading this I have cured it with Vaseline.
Took the fuse box lid off, cleaned all fuses. Saw a connector at the bottom and cleaned that up. Greased all the other connectors I could find and car runs sweet. Get a slight whiff of smoke evey while - I think the turbo is on its way out.
Got a mot now - it flies. Absolutely flies. If only someone tuned one of tese and out it in a five.
Oh wait...,