93 sts rough idle and fluttering under acceleration
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Northstar Engines and System Technical Discussion Discussion, 93 sts rough idle and fluttering under acceleration in Cadillac Engine Technical Discussion; hi guys today after driving my 93 sts for about 1.5-2 hrs and after just coming off the freeway i ...
  1. #1
    silver duke is offline Cadillac Owners Member
    Automobile(s): 93 cadillac sts seville
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    93 sts rough idle and fluttering under acceleration

    hi guys today after driving my 93 sts for about 1.5-2 hrs and after just coming off the freeway i switched my a/ c off. my sts than began to idle rough and to flutter under acceleration. the car has 120,000 miles. i than pulled over and allowed the vehicle to sit. after about 10-15 minutes i re started it ran normal i drove home about 40 minutes than once again it began to idle rough and flutter/miss under acceleration. the temperature remained normal although the entire time. i was worried about the head gasket but the temperature has remained normal so far. i will try the regular tune up first but any ideas would be greatly appreciated. i love my sts and need it to run awesome like it did before.before today it ran great, i 2nd gear de- carb it every so often. i already changed the air filter,pcv,and cleaned the throttle body a few months ago not the plugs or leads yet. thanks guys you all help keep my sts on the road

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  3. #2
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: 93 sts rough idle and fluttering under acceleration

    First pull the DTC's. Then if plugs & wires are original, they are due.

  4. #3
    Mountie's Avatar
    Mountie is offline Cadillac Owners Enthusiast
    Automobile(s): '93 STS (sold), now looking for a CTS Wagon soon!!
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    Re: 93 sts rough idle and fluttering under acceleration

    Also the EGR valve?

    I was told, when you need to clean the injectors, to use injector cleaner..... 3 bottles, one every 1/3 tank before fill up. A hundred gallons of treated fuel usually does a good job. When it's time to clean them.

  5. #4
    CadiJeff's Avatar
    CadiJeff is offline Cadillac Owners Connoisseur
    Automobile(s): 1981 CoupeDeville, 2 1990 Eldorados, 1994ETC ,1992STS
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    Re: 93 sts rough idle and fluttering under acceleration

    add coil packs to the list

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