1994 Cadillac STS runs rough

1994 CADILLAC STS
145,000 MILES • V8 • 2WD • AUTOMATIC
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PETESIGN
  • MEMBER
  • 2 POSTS
the new motor only has 40,000 miles i had a tune-up on it a year ago and when i drove it from houston to dallas texas it ran just fine and got 20+ miles to the gallon i am in a rehab facility and just got my car back from a friend and it runs really rough and the computer is saying the average gas mileage now is 8.8 and it is sucking the gas up what do think could be wrong, i am in a rehab center and only get $15 a week and cannot afford to pay for this can someone help me
Mar 28, 2010 at 1:09 PM
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LEGITIMATE007
  • ✓Experienced Mechanic
  • 5,121 POSTS
wow, there are many possibilites, is there a check engine light on?
Mar 29, 2010 at 3:07 AM
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PETESIGN
  • MEMBER
  • 2 POSTS
there is no check engine light on at all
Mar 29, 2010 at 1:01 PM
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LEGITIMATE007
  • ✓Experienced Mechanic
  • 5,121 POSTS
there are only a couple scenarios that could be the possibility without throwing a code, like a dirty fuel filter, which is a number one possibility. Also a dirty throttle body, maybe a bad pcv valve. so I would change all of these, they're all inexpensive and easy to do.
Mar 29, 2010 at 2:23 PM
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