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Rough Idle and bucking

Engine

Vehicle Information: Model: 911 ; Year: 1984; Body Type: Targa; Engine (type, size, modifications): 3.2, K&N Cone filter, Cat Bypass; Total Mileage: 111000;

On a cold start my car will barely Idle. In fact it will stall a few times. Once warm, it will idle a bit better, but nothing to write home about. It also bucks, cold or warm. And did I mention a ton of backfiring?My mechanic is insistent that it is a vacuum leak, based on the fact that there is no change in idle when the oil cap is removed. With that in mind, I sprayed all the vacuum lines, as well as the intake manifold base with carb cleaner to see if there would be a change. There was nothing. Could this be a vacuum leak despite the checks I made? If so, where should I begin looking?Thank you in advance for your time.

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