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Originally Posted by DINO55
GirlBear,
Give her a tune up with, AC delco plat plugs, wires, cap,rotor,air and fuel filters, Clean the MAF, your miles will come right back to you. My 98LS 2wd gets 17-18 city 23-24 Hwy in warm weather. And remember to send pictures of your work.
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That would be a good idea. And it may be time to change her thermostat, too. It is pretty common for them to stick open a little and not allow the engine to warm up enough for the PCM to enter closed loop. Without being in closed loop the PCM won't monitor and adjust the air/fuel ratio.