I thought I had my stumble/carb issue fixed by replacing my malfunctioning alternator and changing the needle and seat on the primary side of my 4180. Everything was good for a few days. Then I started having a similar bog/stumble at light load, usually under 2k rpm as I was tipping into the throttle. It always seemed to go away right as the secondaries kicked in. So after discussing it with a few coworkers today we came to the assumption the power valve was likely toast. So I bought a regular single stage 4.5 hg one (the only one they had in stock that would fit my carb) at advance and figured I would try it this weekend. While at lunch I filled the car up too, at the same place I almost always get gas, and have for the last few tanks. Well the car ran crappy for about 5 miles leaving work, then all of a sudden it's running perfect again? Ran great all the way home, about another 40 miles. It's gone on and off like this a few times. Can a power valve be intermittent?
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