Oh it just occurred to me. It’s that little PCV valve under the intake manifold. So I have to take the top of the engine off again, yay. Could this cause the issues I am having with revving and idle?
I had sprung a coolant leak that came from the heater core pipe, which involved taking the intake manifold off. I just got it all back together tried starting it, and it sputters out the first start or two. After that, it finally starts and stays running, and the RPMs go up and down repeatedly...
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