Cadillac: 1995 Deville, torque converter clutch, engagement problems

Question
I have a '95 Deville, 4.9L.  Trouble codes are:  PO13 history, PO20 history, and PO 39 current.  The problem is a couple of months ago I drove it to the store and when I went to leave it wouldn't start.  It would crank but acted like it either wasn't getting fuel or spark.  After trying to get it started for about a half hour, I removed the gas cap and replaced it after which it fired right up and ran normally until today.  Today I was at home and went to leave.  It did the same thing, except the removal of the gas cap and replacing it didn't make any difference.  Any suggestions?

Answer
PO13 = rear oxygen sensor intermittent fault.

PO20 = intermittent Open fuel pump circuit.

Po39 = Torque converter clutch engagement problems.


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tom