Hi, Hope I can get some help on this one. Vehicle starts on 4 cyls and starts to surge until it drops on to cyls 2&3 only, at this point it won't rev above 2k. I have checked injectors and theres no earth pulse at the ecu to cyls 1&4.

I'm ready to have the ECU tested but wondered if something strange would cause a fault like this on only two cylinders.

All help more than welcome Thanks.