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If you can see a small voltage fluctuation on the 1 & 4 wire, I doubt it would be the ECU, it sounds more like a high resistance in the wire between the ECU and the coil pack, or the ECU connector itself.
A transistor output will either fail as a short or open circuit.
Have you removed the ECU connector and metered out the cable ?
You really need an oscilliscope to check the output from the ECU, at idle RPM the ECU output will be sending a ground shot around 12 times a second.
right, i chased the wires all the way from the coil to the ecu, i actually replaced the 2 outta wires incase there was an internal break i couldnt see, the car is exactly the same..... the thing ive just noticed is that when the cars warmed up to temperature if i hold the revs at around 3k for a few seconds the car actually starts to fire on all 4 cylinders, as soon as the revs drop below 2k even for a second it reverts back to firing on just 2 until i start the process of holding the revs at 3k again.... any idea's where to go next with this?
