I continue to have problems with my 1986 Bentley turbo carburettor. The starter motor comes into operation, but the engine does not always turn on. The last time that happened to me, the motor is switched on only after many attempts. Also, while driving often seems that do not work all cylinders, outbreaks occur in the silencer, sometimes the engine comes to fade, consumption seems excessive. The mechanic has made many interventions and replacements (candles, plug wires, various cables, brush and sensor distributor). The electronic control units (UD26368 and UD23735) have been checked and tested in Britain by Bowling Engineering LTD and are ok. What else can we do? Thanks.