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Old 06-23-2013, 03:40 PM
Gen1dak Gen1dak is offline
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Join Date: Aug 2011
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Vehicle: 1990 RamCharger
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Engine: 1988-1991 318ci (5.2L) LA V8 140hp
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Yeah, sounds like a fuel issue. Ditto on the choke, but beyond that, it sounds like vapor lock. you referred to the "trash" carb as an AFB, that means it's not the original, so even rebuilt, there could be problems with it from sheer age if nothing else. The AFB is aluminum, and your average 360 isn't gonna generate enough heat to cause problems, but the fuel line near the engine could be an issue. This really shouldn't be an issue either since the fuel return line was introduced to alleviate this problem. Is the fuel return still plumbed in? If it is, a quick fix would be wrapping the line in a couple wraps with aluminum foil. If that solves it, you can work out re-routing for a permenant solution. Could be fuel delivery, maybe the pump is getting tired. Electric fuel pump to help out? Are you saying there's an electric pump in tandem with a mechanical pump or just an electric pump. I know the mid-80's was a crossover period for going to electrics, but not sure just when it was on every model before fuel injection. The electric pump could be possibly flooding the carb. Check fuel pressure.
Only vibration issue I've ever heard of related to the 360 is when using a zero-balance (318) converter. The lack of the external balance weight (needed by the 360) causes a vibration.
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