You have already upgraded the fuel pump, which is the first step. It would be wise to install a new fuel filter and adjustable fuel pressure regulator, if you have not already done so. Aside from that, make sure your ignition is in good shape, including distributor cap and rotor, plug wires, and spark plugs. DO NOT use platinum spark plugs with nitrous.
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Moxie Racing
The Nitrous Oxide Information Site