O.K. Next round. Passed on 25/25 HCs. 127 out of a possible 130, so barely. Now failed on NO ppm, 50/15 test. 1067 on a maximum of 990. Would this be the EGR? Why would it pass with flying colors on the last test (see above #s) and fail, just barely, on this test? I put in a new O2 sensor, so that helped.
Any ideas?

Here are the new numbers.
25/25 Test
Reading Allowed
127 130 HC ppm
.02 .83 CO%
792 905 NO ppm
13.0 6.0min CO+CO2%

50/15 Test
Reading Allowed
00073 00134 HC ppm
0.01 0.75 CO%
01067 00990 NO ppm
13.5 6.0 min CO+CO2%