I HAVE A 2003 SONOMA. MY PROBLEM IS WHEN AT SPEEDS OVER 80-140KM WHEN I LET OFF THE GAS AND COAST AFTER A FEW SECONDS MY RPMS DROP TO 1000 AND I GET A LOUD WHISTLING OR AIR NOISE COMING FROM EITHER UNDERNEATH OR FROM THE REAR. BUT WHEN I HIT THE GAS IT GOES AWAY.
ANY SUGGUSTIONS?
THANKS

CF Newbie
Car Enthusiast


Join Date: Aug 2006
Posts: 1

Vehicle Profile:
Year: 2003
Make: GMC
Model: sonoma
I KNOW SOMEONE HAS THIS PROBLEM

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I HAVE A 2003 SONOMA. MY PROBLEM IS WHEN AT SPEEDS OVER 80-140KM WHEN I LET OFF THE GAS AND COAST AFTER A FEW SECONDS MY RPMS DROP TO 1000 AND I GET A LOUD WHISTLING OR AIR NOISE COMING FROM EITHER UNDERNEATH OR FROM THE REAR. BUT WHEN I HIT THE GAS IT GOES AWAY.
ANY SUGGUSTIONS?

sounds like a transmission problem. is it a stick or an auto?

iT IS AN AUTOMATIC

yeah... it's a tranny issue.

Could be from the vaccuum advance on the tranny, or just the vaccuum line is loose or has a hole/leak in it.........

Check your vacuum lines,


does it idle rough as well? if not then im leaning more towards taking it in because a vacuum leaks makes the idle rough.

When you shift into Drive from Park, how long does it take?

When you shift into Drive from Park, how long does it take?

I was thinking convertor also, but he says it makes a whistling sound, so I'm leaning towards a vaccuum leak............