What could be causing my 2001 Oldsmobile Silhouette Van to shake?

Love

New Member
I have a 2001 oldsmobil sil van. It shakes as I take my foot off the brakes and lessens as I accelerate. The Service Engine Soon light started blinking. I took it into a shop and had them test drive it. They said it was the spark plug wires going bad. I had them change it. As I drove it home it was fine. But the next morning it started the same problem again. After driving it around a bit the light had turned off. Next day after the problem arose again and the light blinks sometimes then stays lit after. What could be the problem? Has anyone ever had this problem? Mahalo!
 
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