91 SC 7400 original miles with codes

this was my granmothers car so it sat......alot. Runs great, have a very inconsistant miss with codes 175, 176, 177, 189, and 543. This car has the original fuel filter in it, but i can't believe it would need 02 sensors with that few of miles. Experts please chime in.

Leaving a car sit is just as bad as driving it 60,000 miles a year.

175-no voltage signal on bank 2 (not sure, but i think thats computer troubleshooting itself. no biggie there)

176- lean bank 2 (driverside)

177- rich bank 2 (something's wrong here, you might want to check the codes again)

189- lean during part throttle

543- fuel pump circuit failure (usually the relay or bad fuel pump)

You can scrap the 177 code because obviously you're lean. Everything on a car works best only if used frequently because thats what its made for.

Give the car a very thorough check for vacuum leaks. I had a 90 that sat for a year and the Teflon seal around the top IC tube just went bad. The computer kicked out all kinds of codes (O2 sensors, MAF, lean, etc...), but it was just a simple leak. I fixed it with the solid gaskets from tbird88 and it works great now.