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There are two distinct lines of maintenence - replace upon failure and replace 'while in there'. I generally fall into the first group, and before taking your engine off-line I'd check the fuel pressure thru the rail - if it's normal I would not replace it.
For a rich condition, I'd check the following:
fuel pressure
injectors for leaking or poor spray pattern
o2 sensor unless it runs rich right from cold start
CHT
air flow meter
air temp sensor
Chuck.H
'89 TurboLookTarga, 372k miles (currently in Atlanta, yikes roads are bad!)
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