First, check the air ducts for leaks! It is necessary to check all the hoses - from the thick sleeve of the air intake to the thin vacuum hoses.
Are the seals under the starting fuel valve and on the injection nozzles in order; as well as inlet flange gaskets?
Leaky places open access to unaccounted for air, that is, air that is not taken into account by the air flow meter and therefore significantly interferes with the preparation of the mixture. The mixture leans uncontrollably. This results in engine malfunction and rough idling.
Can a fuel line leak be recognized?
Were the wire ends repeatedly separated and reconnected? Corrosion or tampering may result in poor contact.
Consider the plugs of the individual components of the injection system. Do not bend the contact tabs, but treat with contact spray.
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