Basic guide to explain why your car is going "bat s^&t crazy"!
Your ecu, regardless of car, uses a lot of sensory inputs to make it work, how it does this is a part of a recalibration/remapping thread I am doing and too complex for here. Suffice to say, if these sensory inputs are not correct or make no sense to the ecu, it doesn't like it and throws a wobbly! Due to the fact that many sensors can be used for the ecu to check in one area - i.e. it looks at 2 maps with engine rpm v's coolant temp on one and engine rpm v's voltage on the other, it is essentially looking at 3 sensors her