02 535i has a strange "bogging down" when at cruizing speed.

[ratgod13]

This strange bogging down only occurs when I am cruizing through town or on a highway with the gas held slightly, not accelerating and not decelerating. It has no cold start issues or rough idle. I have been checking all vaccum lines and changed my spark plugs. The only issue the car has is a bad wheel speed sensor. I would really appreciate any guidance and help.
Justin.

[ratgod13]

Update.... The vacuum line to the fuel pressure regulator was split, fixed it but still same issue.

[edjack]

What codes are stored, even though the CEL is not on?

BTW, we did not get the 535 in North America.

[ratgod13]

There is no dealer near me but advanced auto says p0491 p0492 were all it had. Yeah dang auto correct its a 525i.

[ratgod13]

Update.... Yesterday during a heavy rain storm my car went into trans safe mode. Battery is good, alt is charging at 14.4. Any idea what's up with it

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Update: I have checked all fuses and left the cars battery unhooked for one hour in hopes of resetting the computer. No luck.

Update: it was a wet sensor, dried it reset computer and all is well.