Blocking off the egr on the 97 is a bit more complicated. You'll need to add a breather filter to the egr valve otherwise you'll get a CEL.

Personally the first thing I would do on a 97 is pull the intake manifold and clean it out along with the intake runners to restore full power. While it's out, check/replace any failed vac hoses to the intake flappers that could cause a CEL later on, check replace any bad fuel lines, check engine wiring harness.




While you're in there, check replace the fuel return lines on the injectors, cut the large plastic injectors cover in half so you can remove it without first pulling the large aluminum cross over pipe in the future. Also there are 12 crankcase ventilation holes in the intake runners with broken plastic fittings for each. Plug them up so you don't get any more dirt leaking in.

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CENSORED due to not family friendly words