Transmission problem
1994 Chevy S-10 6 cyl Two Wheel Drive Automatic 170000 miles
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My S-10 used to accelerate quite quickly, but for the last few months, it's been struggling to reach 60 in less than 15 seconds. It sat all winter, but all the fluids have been changed. I also changed the fuel filter, PCV valve, air filter is clean, and it just had a tune-up about 5,000 miles ago. There is the correct amount of air in the tires. I took it to the shop and they hooked it up to the diagnostic and found nothing wrong. Besides the acceleration problem, there seems to be nothing else wrong... except for horrible gas mileage. I used to get 26, now I'm down to 17. Yikes! Please help. Throw out any suggestions you think would work!! Thanks!!

Have the exhaust flow tested. Sounds like the converter or the muffler is partly plugged. Also check ALL the wiring to the sensors and engine, Sitting that long may have allowed a mouse or two to snack on the wiring.