I have a continuing problem with my 94/ 302. I get hesitation and sputtering. The check engine light comes on: code 172. I replaced the one o2 sensor and ran fine for 1500 miles and then the same thing. Thought the o2 sensor was bad. Replaced with a new one. Ran fine for 2000 miles; now I get hesitation and code 172. ?? Checked all vacuum lines. Replaced most of them just to be safe. Replaced the o2 again. Ran fine again; for 2000miles. Cant figure out why I keep blowing out o2's. Could it be my Maf?

 

Found my own answer. It appears that these vehicles have a problem with the MAF sensor:
http://autorepair.about.com/cs/generalinfo/l/bl827d.