2003 Chevrolet Astro Motor shaking.

2003 CHEVROLET ASTRO
130,000 MILES • V8 • RWD • AUTOMATIC
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KITMS7
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My van motor shakes when I drive it but it doesn't have a miss in it. It has also been using more gas. The problem started when I put Marvel Miracle Oil into the engine. Can you tell me what could be causing it to do that?
Dec 17, 2013 at 3:26 PM
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HMAC300
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it may be carbon broke off someplace, but scan for codes and check fuelpressure first with a gauge. then check for a broken motor mount.
Dec 18, 2013 at 7:54 AM
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KITMS7
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Could it be ?the spider inside of ?the engine that ?the gas run through? Its not ?the motor mount. Its more of a vibration that runs through it
Dec 18, 2013 at 10:46 AM
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HMAC300
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it may be but tht would normally set a code. checkfor a vacuum leak, hoses etc. it may be that. if a spider goes bad normally the vehicle won't start.
Dec 18, 2013 at 11:58 AM