starting problem

[G40_POWER_AD]

hello mates.... i have a problem ! my car when stay many hours to sunshine the engine seems to cost starting but in the garage with the cold engine starting good.... i change a new distributor and new temperature sensor and alternator etc etc but the problem persist...the car have a fail between 950 rpm 1100 rpm when blip the trottle but the engine timing is okay....with a multimeter i measured in the engine coil 2 volt aprox in the ecu wire the green wire.....strange but my other friend G40 give 3.20 volts....and work very better.... where is the my problem ? sorry my english boys