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Thread: Car surges at idle and throttle

  1. #1
    Club Member 91Bird305's Avatar
    Join Date
    Nov 2003
    Location
    Michigan
    Posts
    9,847

    Default Car surges at idle and throttle

    I have an 87 GN motor I transplanted into my 91 Firebird. I pulled it out of storage about a month ago. It has been in storage for over a year now. Initially, the car ran fine at idle and on the road. No surging or stumble @ idle or on the throttle. It was only recently when I took it out that I noticed the idle was rougher sounding than normal. When I took it out on the road and would give it any throttle, it felt very under-powered, it would miss and sputter a bit. Not enough where it would fall on its face, but it's not running right. Some background on the car:


    -Walbro 340 w/ Hotwire Kit
    -Accufab 65mm Throttle Body / Plenum w/ RJC Powerplate
    -72lb Seimens Injectors
    -LS1 Maf w/ Translator +
    -Extender Extreme Chip from FullThrottleSpeed.com
    -GT6776s
    -212/212 Roller
    -Ported/Polished stock heads

    If you need anymore info, let me know.

    My scanmaster #s after the car warmed up @ idle:

    AF - 02
    L8 - 29
    Clt - 172
    bAt - 13.4
    Int - 128
    bL - 128
    Ats - 127
    TPS - .46
    IAC - 59
    MAL - 0

    My iac and tps seemed high. Any other numbers stand out to you guys?

    I'm also getting knock @ 10lbs of boost. Running 93 octane w/ an alky control system.

    I did a resistance test on my coil pack (Car cold - 1-4, 3-6, 2-5), with the key turned on and each time it read 8ohms. (set to 20K). I believe it's supposed to be in-between 11-13K. I went to Oreilly's and tested a new one there and got the same numbers. So, it might not be the coil pack. I tested the resistance for each wire and each one came back normal/matched the other wires.

    Any ideas? I'm going to try and pull my plugs soon and check to see how they look as well. I'll report back when I see how those look.

    Thanks in advance
    '91 Firebird - LC2 3.8, 6776S Turbo, Alkycontrol, S60 Rear, ProBuilt 700

  2. #2
    Club Member Beigg's Avatar
    Join Date
    Feb 2009
    Location
    I am here >x<
    Posts
    5,376

    Default

    Check for a vacuum leak. Check over the vac lines going to each sensor reference port.

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