Just to be sure , its not that your trans is shifting too early right? my 1992 feels slow when it shifts into fourth and it should be in second thus eliminating any boost i might get if it was in second or third. Whenever i feel i have power issues i mannually shift through gears and make sure its not that.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius