M42 idle

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  • firstE30
    Member
    • Oct 2013
    • 98

    #1

    M42 idle

    Hey all,
    I am having an idle issue on my 1991 with the m42. When it is just sitting idling it sounds fine but if you touch the gas it hesitates and if your driving ariund and clutch in the revs fall too low so the motor shakes before it stabilizes. I hear a whooshing sound coming from the back of the engine closest to the firewall. What could it be?
  • MrSlacker
    R3VLimited
    • Feb 2010
    • 2494

    #2
    Vacuum leaks. There are a whole bunch of vac hoses that love to leak on M42s. Also check your intake boot for cracks
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