1995 Oldsmobile Achieva Slows down and speeds up on own

1995 OLDSMOBILE ACHIEVA
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CHELSEANAOMI
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1995 Oldsmobile Achieva 6 cyl Front Wheel Drive Automatic 106k miles

I will be going a certain speed then all on it's own my car will slow down for a second then speed back up. It hasn't done this for a few months after I bought it. But I got a under body car wash yesterday and it did it on the way home. And it has been doing it on and off ever since. What could cause it to be doing this?
Oct 15, 2010 at 7:52 AM
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RASMATAZ
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Could be the vehicle speed sensor and oxygen sensors-check the wiring connector
Oct 15, 2010 at 8:37 AM
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CHELSEANAOMI
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Does it have something to do with under the car or under the hood?

Do you have a diagram?
Oct 15, 2010 at 8:43 AM
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CHELSEANAOMI
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I don't have any plug wires or distributor cap.
Also, It's a 4 cylinder not 6.
Oct 15, 2010 at 10:01 AM