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I just sent the car to the tuner who tuned the ecu for the 2.0 engine, and according to him these were the issues:
1. The overfueling was caused by a non oem map sensor - oem map sensor with a new oem coolant temp sensor fixed that. The car now idles smooth, drives fine - no jerking.
2. The speedometer fault - car does now want to drive with speedo plugged in (electronic speedo) -- tuner says that when an ecu is decoded "A WIRE" has to be cut off for it to work normally.
I dont really know how true this is because when I manually tested the non oem map sensors, they worked fine and as it should. he did replace the mentioned sensors though.. I got a feeling that he did something incorrect in the ecu when he tuned it and fixed the mistake when the car was taken to him, and used oem sensors as an excuse..
But anyway, as long as the car is running fine the owner is happy and I am happier that I dont have that headache any longer.
