Hopping that they have checked the fuel pump and it is working. I experienced the same task few days ago until i changed the pipes and am sorted now
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Before the garage day try with sensor cleaner and see how the car behaves. Many have improved after cleaning the sensor
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Mine is a 270cdi but am not sure if it works on a 320 too. But ask the mechanics if it works well then you may opt for that. However you could also use throttle cleaner spray to clean the maf sensor. It always works
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Hey guys thanks for all the info put the car in the star and realized i had lost the inlet valve so bought a new one at 160 dollars
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