1996 Mercedes Benz S420 Car Seems Back Firing Down On Power Starts Fine Ive

1996 MERCEDES BENZ S420
150,000 MILES
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ANONYMOUS
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my car seems to be back firing and it is down on power. The car starts up fine. Ive had it 2 and a half yrs and used mainly reg gas. it is also sticking in 1st and 2nd gear 40 mph and 60 mph especially going up hill.
could this be a cat problem or hopefully some thing else?
Nov 18, 2012 at 4:15 AM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
Replace plugs and leads and do a comp test as well, start here.
Nov 18, 2012 at 9:23 AM
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