I've become a fan of chasing the ground points down to be sure they're not weak. There's a ground strip just in front of the battery that showed a lot of corrosion on my '94 and was the likely culprit of my recent problems--clean the hell out of it with 220 grit and tighten the connectors. I also saw a paragraph in either Mitchell's or Alldata that described a similar procedure for the DTC readout box A&B itself....pull it apart and be sure there's no corrosion in the connections underneath it....
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