I've got a 1988 Camaro 2.8L, which suddently died while driving it.
I've diagnosed the problem to an ignition issue- there's no spark. It
turns over fine, and appears to be getting fuel, but no spark at the
plugs.

I recently replaced the distributor, including the idnition module.

I suspect that it's one of the emission control components, and have
checked all connections..

Any ideas?