Most of the problems I've had with these cantankerous beasts (and I say that with a great deal of love in my heart) are the electrical connections. The insulation cracks, they get wet, and changes in the weather can make them more irritable than me. Check all the ground connections, too-- I once had a '72 die on me and after hours of fidgiting with it finally gave up and had it towed home where I realized that the injector ground cluster ground on top of the rear of the intake manifold, although firmly bolted down, was not making a connection. This may not be the case with your car, but electrical connections are oftentimes the culprit.
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