Yeah, removing and redoing the add-on electronics is pretty high on the todo list. It's just a matter of picking my battles right now. Hear you regarding the battery. I hope it's not as bad as my last '89, that one had three(!) alarm systems fitted that were all engaging in competitive battery drainage.
As to the MAF, I already have some MAF cleaner somewhere (we recently moved house so "somewhere" is still a bit of a fuzzy geographic location) so I'll try to clean it while I'm in there. Can't hurt. The filter does look like the regular Autothority filter that came with the kit, and it does look like it might be an K&N style filter. It also looks like it hasn't seen filter oil in quite some time. I probably have to pull it anyway to get better access to the sound deadening mat that's falling apart, too:
Diagnostic plan has a few more items added to it:
- Check fuel pressure
- Pull the DME as suggested and while I'm in there, replace the DME relay.
- Clean the contacts for the relays and fusebox connectors, plus the usual checks and cleaning on electrical contacts, ground straps etc.