To make a signature like mine, follow the instructions here:
http://ecomodder.com/forum/showthrea...ure-20941.html
You'll also need a fuel log, which you can create for your car(s) in the "Garage" section linked at the top of the page (next to Store, Wiki, Home).
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After some google'ing I'm still not able to tell for certain if your car has an EGR valve or not. Does it run rough at all? I'd probably replace the EGR for good measure anyway since it's so cheap.
I'm pretty sure the 98 still had a mechanical distributor. You might visually inspect both to see if the spark advance is roughly the same. Retarded timing could cause lack of power too.
Anyhow, I recommend starting a fuel log and reading the tips here:
100+ Hypermiling / ecodriving tips & tactics for better mpg - EcoModder.com
Perhaps someone else will come along with some more ideas related to your lack of power.