I have a 1997, 1.8 Freelander petrol. I have just reconditioned the engine after head gasket trouble. It is now struggling to start and then chugs and nearly stalls when the revs fall. It was a non runner when I bought it. I have to disconnect the injector electrics to get it started. It smells strongly of fuel so I suspect it is overfuelling and running rich. Any ideas what could be causing this?