Can't sleep Denny?????????
This install is pretty well butchered up to be looking for a couple idems that are causing the symthongs-----------what I see that are sorta pointing to multiple potentional problems are rusty header on one side----good looking one on other side-points to exhaust system area as for leaks, O2 sensors,(later systems have 4 sensors), MASS aIRFLOW has no tube/ host on inlet side-they don't read good without it-------
Also California cars had different rules and smog systems----------probably pretty much ignored in this set up---------- is it street driven or strictly off road???

The first thing I would do to sort this out would be add a 2 foot long tube to that mass air flow sensor intake AND also make sure no goo on the sensor-( some off road/race customers have had KN and similar air cleaners blue goo contaminate them)