I have an EB MPI 3.9L which has a surging/hesitation problem when the car is cold. It goes away after a minute or two but it's really annoying. So far i have replaced the temp sensor in the thermostat housing, tried another CPU,tried 2 other TPS sensors,swapped a fuel regulator, all to no avail.
Does anyone have any advice on where else to look? I'm running out of ideas.