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I have 92 Sable with a 3.8. Sometimes when I am driving around 40mph, the tranny will upshift to the next gear and the RPM will drop down to around 1200ish. When this happens the car behaves like a car with a manual tranny when it was upshifted to early. It doesn't chug or anything like that but there is a definate vibration that goes goes away when you step on the gas and increase the RPM. Is this common? Is there anything that I can do fix this or just step on the peddle
?
Spiff

Spiff