Misfires, MAF, and K&N filters....

I only had one or two misfires a couple years ago, and they never returned, but I have been searching for a phantom vacuum leak and/or MAF problem for three years. My M54 has high "lean" fuel trims.

I've smoke tested with a homemade tester several times, then with a good factory built unit, several more times, and found nothing. I also used carb cleaner spray as well.

I can unplug my MAF and it stumbles and stalls, and the cheap MAF I'm using reports accurate GMS/sec, unlike the OEM Siemens (which was wildly inaccurate, the last time I used it).

As for oiled K&N filters: I used to use them on all my vehicles, but stopped a few years ago, because they were affecting the MAF sensors on the newer vehicles. But, I continued to use them on several pickups and my race car, because they were old-school with big V8's, big carburetors, and no pesky MAF sensors.

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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide