What would cause a severe loss of power to engine and abs light and bouncing speedo all at once It's on a 1999 GMC Savana 5.7 with 170k I have seen about 3-4 other people post but no answers?

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What would cause a severe loss of power to engine and abs light and bouncing speedo all at once It's on a 1999 GMC Savana 5.7 with 170k I have seen about 3-4 other people post but no answers?