There is nothing worse than chasing an issue after someone "worked on it". When in doubt, replace replace replace it all. Plugs, filters (air, fuel, cabin)
Confirm the following:
There is no oil down in the plug wells.
The air intake does not have a bird body down in there somewhere....
The throttle body plates are clean (Berkebile Gum cutter works great)
Charging voltage is above 13.5V at idle and is above 12.3V with key off.
The oil vapor diaphragms are working.
There is more but these will get you started
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2005 X5 4.8IS
The
Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green