Before you replace the ignition module, do one thing: Disconnect the distributor magnetic pickup connector and reconnect it. This connector can be the source of some very elusive intermittent no-starts that people blame on the control box. The connector is poorly designed. The female portion is simply a round tube with no tangs to positively connect to the male portion. The quick fix is to carefully and gently squeeze the female portion with pliers to crush it slightly and create a better interference fit.