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rough idle
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  1. Vintage Mustang Forum
    I am at a complete loss. i Have a 65 200ci that won’t idle right. When I start it up on cold start it idles beautifully for about 10 seconds then it begins to misfire and drop rpm until it dies. I have tuned the carburetor to the best that i can. these are the parts i have replaced Fuel: new...
  2. Vintage Mustang Forum
    I just picked up my first mustang a couple months back and am trying to chase down an ignition / mix issue. I've been having a rough idle since I bought her, and trying to chase down what exactly is going on. It appears to be running rich. So far I have: Cleaned & restored the carb (600CFM...
  3. Vintage Mustang Forum
    Hello folks I've got a 64 1/2 with a 260 v8, 2100 2bl carb. Engine starts with no hesitation and runs super smooth when cold, even after sitting up in the garage for several weeks. But recently once the engine gets warmed up after riding around for a while it starts to idle really rough when I...
  4. Vintage Mustang Forum
    I’m kind of stumped. My passenger side valve cover has a PCV valve AND oil fill breather cap. Driver side just has oil fill breather cap. Is this setup ok, or is there a possible vacuum leak here? I’m having trouble smoothing my idle, even with spot on timing. Vacuum is on the low side, 6”...
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