I suppose they (knock, MAF sensors) could, but they're really expensive. If I were you I would start with the cheap stuff first. A new fuel filter shouldn't set you back that much.

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"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles