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Lou P
Lou P, ASE Certified Technician
Category: BMW
Satisfied Customers: 4487
Experience:  15+ years experience in the automotive field on all types of vehicles with access to diagrams and repair info.
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My 2003 540i w 140k mi has new NGK plugs, new valve cover

Customer Question

My 2003 540i w 140k mi has new NGK plugs, new valve cover gaskets, new fuel filter, new coils & boots. Fuel pressure tests good. Running very rough before new coils. Much better now, but still bogs and bucks at 1500 RPM & up. Accelerates great. Still feel a soft "miss". Don't think it's the PCV... no change when I pull the dipstick out. What's up?
Submitted: 1 year ago.
Category: BMW
Expert:  Lou P replied 1 year ago.

Hello , has the check engine light gone off ? Was there any codes ? The first thing that comes to mind is torn air boots for the intake but usually you have a check engine light.