bdmartin

The vacuum system may be incorrect - but the only thing that really matters is that the EGR is supplied with late ported vacuum and is opening correctly. The rest of the vacuum system really doesn't effect emissions enough to matter.

There is a passive air injection system that supplies oxygen for the old cat's to work effeciently - a new cat wouldn't need it but if you are conviced the old cat is still good then this system must function properly. It consists of two reed valves that are hooked to metal pipes that run to spacers between the heads and the exhaust manifold. Look for the spacers and trace it back to the reed valves - pull off the plastic silencers while the engine is running and insure that you can feel/hear the exhaust sucking in air. If they have been blocked by a previous owner to prevent backfireing you will hear no change.