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Thread: 1990 Iron Duke stumbles at idle?

  1. #1
    Junior Member
    Join Date
    Mar 2015
    North Carolina
    1990 Buick Century Limited, 2.5L Iron Duke "The White Shark"

    Default 1990 Iron Duke stumbles at idle?


    My 1990 Century Iron Duke sits at our beach villa year round. This weekend I cranked her and did some highway driving. Noticed at first she was stumbling at idle, figured a good Italian tune-up would do the trick, no dice. After the highway run still almost stalling at idle. Past summer I changed plug wires (not plugs), yesterday I shot some carb cleaner down her throat, no change. Drove her 2 weeks ago and this was not an issue. Any ideas? TIA

  2. #2
    Senior Member
    Join Date
    Oct 2013
    Northwest Lower Michigan
    1989 Celebrity CL 4 door 3.1, 1989 Cutlass Cruiser 3.1


    My first thought when I hear about a car sitting is bad gas. Try a drygas in the tank and see if it improves.
    1989 Celebrity CL 4 door, 3.1 MPFI, 4 speed auto, summer daily driver
    1989 Cutlass Cruiser wagon, 3.1 MPFI, 4 speed auto, special summer ride
    1996 Cherokee XJ 4 door, 4.0, 5 speed, winter daily driver & towing vehicle
    1991 Tracker 2 door, 1.6, 5 speed, needs work
    Previously several Celebritys, 6000s, & 2 U-vans

  3. #3

    Pontiac6ksteawd's Avatar
    Join Date
    Sep 2007
    Brighton, CO
    GMC Envoy XUV, Pontiac Aztek GT


    Dont forget to make sure the EGR is not leaking, or any intake vacuum leaks.
    Brian - Carpe Diem

    I dont have to love my president, or any god, to love my country!!
    More people have died in the name of "God" than in all wars combined thruout history
    01 Pontiac Aztek GT AWD 125k - 04 GMC Envoy SLT XUV 192k - 05 Buick Rendezvous CXL Sport Plus 61k

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