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Not sure if this mechanical or not, but hoping someone can help. My 51 reg 2.0 when ideling will develop a rev fluctuation from the normal idel speed sometimes up to 1500 RPM and back again. It happens when hot and cold and will go for weeks with no problem at all. Ford are not interested in sorting it out saying "well it might need a software update". As soon as power is applied this stops and there seems to be no loss of power or fuel consumption (usually delivering around 38-39MPG)
Anyone got any ideas?
Anyone got any ideas?