That info is a little vague. Have you done any mods other than 5speed swap. Make sure your sensors are all plugged in, the front o2 harness goes beside tranny, starter and I have seen that get tangled in the axle before. If you were holding accelerator steady and it was doing that, I might lean more towards an ignition problem may be due for tune up replace cap, rotor, plugs and wires.
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