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I just bought a used 2001 IS300 this past week. I have driven severeal IS300's, and this car seems to be low on power from the start, and then seems to surge at 4k rpm's, then the power from there on is normal. Any ideas on what to look for here, MAF sensor maybe?? Any input is appreciated.
 

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Mine feels the same way...2001 IS. At 4k it feels like a power band kicks in. Before that rpm range it feels like it's being restrained. Have you cleaned you maf sensor?.....did it improve the condition? I have never touched the maf sensor, the car has 64k on it now.
 
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