JIMMYRIG Posted 4 hours ago Share Posted 4 hours ago I'm getting high idles and a whirring/whining sound (maybe vacuum leak) plus bad throttle response. It used to just happen after freeway driving, now its as soon as the truck is warm and gets worse after driving. Idles at like 2k sometimes after sustained freeway driving. I've chased all the vacuum lines and sprayed with brake clean, I had a thought it could be brake booster, maybe IAC (although its new and made no difference unplugged), or cracked intake/bad manifold gasket. Any ideas? Link to comment Share on other sites More sharing options...
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