before you do anything else, I had that code and it ended up being my fuel pressure regulator!!!!! I have a 95'STS. While the car is running, pull the vacuum from the FPR. If there is any gas there, even a tiny but. Then it is bad and you are sucking gas......I know it's like $118 but my car runs so much better now it was like night and day....
Alex

 

the 94 has theFPR in the intake (no vac. hose) but I will look into it ..... I did all the diagnostics from the servive manual and #6 injector was not getting ground from the pcm......but i will look into the FPR a little more. thanks