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I had the same problem as you, except I don't have my Walbro in. My first start of the day would be sucky, and the idle would drop and raise until it warmed up.
I would check the vac hose going from your fpr to your intake manifold .. Mine was dry rotted, when I replaced the line it got somewhat better, along with an idle adjust because my idle was pretty low anyways.
I still need to recirculate my BOV, and change my brake booster lines so I won't die when coming to a stop.
Not sure if any of this will help you, just a suggestion.
I'm still alittle shady about installing my Walbro because of this.
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