My similar problem was wires off the ASD (automatic shut down relay). Also, discovered battery can slide into computer wiring harness, disrupting sensor input / output signals. I placed 1" spacer on rear battery clamp to push battery forward and this problem (backfiring/lurching/bucking) under certain driving conditions (rough roads / turns) stopped. (may be related to install).
Have you checked the firing order to make sure the plug wires are in correct order. Sometimes an engine will run but rough if 2 wires are mixed but it could be that there's more than 2 mixed up.
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my similar problem was battery sliding into computer wiring harness disrupting sensor input / output signals. placed 1" spacer on rear battery clamp to push battery forward away from computer wiring. solved my problem. Also replaced front exhaust manifold O2 sensor, that was responsible for bucking after cool down of engine after 20-30 min., which cured that problem as well
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