Van towed in to us as a non starter. customer has there own scanner and said there was a code when it started to misfire which said injector 2&3 short to earth.customer had cleared all fault codes so can only take his word for it.theres no codes stored now.also the fuel gauge has stopped working. we have fuel to filter and out of filter. removed rocker cover and checked injectors all seem ok.not sure what readings there should be at plugs to injectors. i know the 4 cyl wiring and injectors are troublesome but havent come across this engine before.any advice! Thanks