normally with a misfire on a cylinder points to a bad spark plug did u change the spark plugs first to see? also what type of gas do you use?87 89 91? bmws are effy on what they want, look at your gas tank lid it should say what type to fill it up with only

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2014 Jeep Rubicon unlimited 3.6
2005 X5 4.4i
2002 Jeep TJ 4.0 SOLD
1997 328I 4 door 2.8 SOLD