Going to buy a new EGR valve and MAF for the 98 S10.

Best price for DELPHI EGR on RockAuto (before discount) 124.99 + shipping. Ebay, 74.95with free shipping.

Same with S10 fuel pump, over $50 less on Ebay. If you are not in a hurry, might be worth cross referencing part numbers from Rock to Ebay. A word of caution- be careful as some Ebay vendors are selling what you think are AC/DELCO or DELPHI and they word it to trick you but it ends up being a Chinese knock off.

And from what I've heard that is a very often practice on Ebay. And not just auto parts. I bought a Dell power supply as stated recently. And when it came it was not the case. The original item and part number were on the invoice along with a "replaced with" correction. The unit I got did not have a SATA cable long enough to reach the CD/DVD drive in my Dell and I ended up getting an extension that had a SATA connection on one end and the old school 4 pin on the other to tap onto an extra 4 pin coming off power supply. I would read comments for any eBay vendor, and contact them to guarantee your getting OEM as stated.