spent another day on the car with no joy

mate came round in his running efi turbo took off his iscv and still ran shit took his map sensor off and supressor still no joy, check all the wiring again and its the same,

totally lost now will only idle with map sensor unpluged as soon as u connect it back up it stalls straight away,

its got to be somthing minor just dont know what else to try

has anybody come across this when they did ther efi conversion?