Quote:
Originally Posted by mattfranklin
I'm grabbing at straws here, but have you checked for additional vacuum leaks? If someone had suggested that to me I'd be like "What are you kidding? I'm very careful and methodical. That's very unlikely." But recently I discovered that I had left off a cap for a 3/8" hose barb hidden under the back bowl of my carb. Once fixed, my idle really straightened out.
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I have not done a recent check for vacuum leaks since replacing the the intake manifold but wouldn't I get way less than 15 in of vacuum if I had a leak?