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Nasty surging under load Djet 140-160 1971

Hey everyone! Ok, I have a massively bad surging, bucking problem through all gears, under load. Decelerating there is no bucking. The surging is uniform even in neutral. I'm thinking it's a TPS, ignition timing problem, or fuel pump problem? The engine is b20e. I checked for any vacuum leafs around hoses to manifold and distributor, and anywhere else and couldn't find any loose hoses. Any thoughts and help is greatly appreciated!






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