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Is the truck running any different? If it's stumbling or down on power I would start by looking at the maf and checking all my vac lines. You can clean the maf with spray cleaner and reinstall to see if that helps, but there's a chance it's failed in which case you will need to replace it. What model X3 do you have so I can look and see if I have any notes on it.
ECS Tuning
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