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  1. #1

    Default Rough Idle and hesitation

    89 c1500, 281,000 miles, 2wd, automatic

    Rough idle like a lope, major hesitation falls flat on its face wont even take gas, it will die sometimes when dropped into gear. Some days are better than others, sometimes it runs perfect so it comes and goes. I have replaced alot of parts already. I'm in the process of restoring it.

    Please help, any ideas or suggestions would be great

    Parts replaced:

    IAC valve
    EGR solenoid valve
    ignition coil
    cap and rotor button
    plug wires
    map sensor
    all vacuum lines replaced
    fuel filter
    air filter
    ignition control module
    throttle position sensor
    timing chain
    valve guide seals
    Last edited by 89silverman; 05-06-2010 at 08:54 PM. Reason: adding more parts changed

  2. #2
    Master Mechanic bigdaddy77084's Avatar
    Join Date
    Jan 2010
    Houston, Texas, United States


    bad cam?? did you do a compression test ???
    95 tahoe 2dr 4x4 200,000+ miles

  3. #3
    murdog94's Avatar
    Join Date
    Feb 2008
    Cloquet, Minnesota, United States
    Blog Entries


    Have you taken a look at the injectors to see if they are spraying consitently when it is running like this?? Also have you checked your fuel pressure when it is running poorly like this? mine is running off currently and i will be doing a fuel pump hopefully next week, and that us my culprit.. Have you done a swing test on the TPS?? Since i have seen new out of the box TPS that fail... PCV valve checked??? Also what shape is the cat in?? Since if it is plugged it can cause similar problems..


    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  4. #4


    Have you check any codes?

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