Some BMW 440i Gran Coupe owners report experiencing engine stalling after reversing and then accelerating, which can be attributed to several potential issues. Commonly, problems with the fuel system, such as fuel delivery issues or a clogged fuel filter, are reported to cause stalling during acceleration. Additionally, blockages or sensor malfunctions in the air intake system may also lead to similar stalling occurrences. Faulty components in the ignition system, including spark plugs or ignition coils, are further contributors that some owners have identified. Furthermore, those transitioning from a manual to an automatic transmission may notice a jerky feeling during aggressive acceleration, which could indicate transmission-related issues. To address these concerns, it is recommended that owners have the fuel system, air intake system, and ignition components professionally inspected, and if problems persist, a thorough examination of the transmission system may also be necessary.
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