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I bought a 2001 Chevy Suburban that the computer is not reading when put on a machine. I was told it may have electrical problems but everything in the dash panel is working inluding message center. Could it be fuses? I also replaced spark plugs but it continues to vibrate a little. The warmer the motor gets the more vibrating and hesitating it does. Any idea what this could be since I cant get a read from the service engine soon light?