The car gets fuel when turning over but there seems to be a loss of spark. This is random as it can drive for hours with no fail then cut out. It wont start then after sitting for a while the car will fire up. Its a big turbo model and uses a coil and dissy. Is it the same set up as the MFI RST? Live to the dissy, pulsed to the coil then fired on the HT lead to the centre of the dissy and displaced by the rotary arm to each plug? If this makes sense?