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Is the engine bucking only when under load? Does it idle smooth? If you increase the engine rpm when setting still does it buck?
One thing I would check is the fuel pump. Maybe when it is cold your supply pressure may be low or irratic. Find some one that can tap into the fuel bar with a pressure gauge and evaluate the pressure when it is cold compared to when it is warm.
Good luck
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Best regards
Keith
92 964 Coupe
99 Volvo xc70
02 BMW 330xi
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