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Well you are replacing the normal fuel source, so obviously the engine is not getting fuel thru the injectors. So, have you checked fuel pressure with a gauge ? Do you know for sure the pump is running ?
Inspect first the automatic transmission fluid. It may need replacing as well as the filer. Observe the jerking if it occurs on certain speed, it may just be an issue within a specific gear. Its valve may be dirty and need cleaning. This may also be cause by bad fuel lines or dirty fuel filter which causes inconsistent flow of fuel. Check also the engine support and mounts of the engine and transmission. They may be worn out. The jerking could be from the actual **** of the engine because it is not held in place correctly.
Check for spark. Pull a plug and ground it DO NOT HOLD IT WITH YOUR HAND. Then have someone turn the motor over as you watch.
Assuming that's good, check the fuel system. It could be a clogged filter, a stuck (float bowl) needle valve in the carburetor, bad fuel pump, or water in the tank/carb.
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