when you changed all those things... did you have the battery disconnected??? In EEC-IV environment, that should clear the codes from the computer memory... I would suggest getting the $35 engine code reader from about any decent autoparts store. They work great, as long as you don't have some moron doing his lawn 20 feet away while you're doing it... LOL...

Long story... LOL... Anyway... you may have residual codes in the EEC memory.... disconnect the battery, turn the key to the on/run position... let stand for about 15 - 20 minutes... turn key to off position... reconnect battery... run diagnostics... and watch check engine light activity...
the more things change, the more they stay the same...