clean all your sparkplugs and coils. there iss a good chance the valve cover gave way and there is oil trapped in each cylinder's coil housing. check for oil leaks around the valve cover gaskets as well. that should be your problem. you can also take one coil off at a time and check for spark to rule out faulty coils

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2001 X5 4.4i WHITE-Loaded like a baby's diaper SOLD