Mechanics

MERCEDES BENZ S420 GAS PROBLEM

1996 Mercedes Benz S420 • 150,000 miles

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?
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Guest
November 18, 2012.



Replace plugs and leads and do a comp test as well, start here.

Mhpautos
Nov 18, 2012.