Vacuum pump not coming on?

[tomtom72]

I need some help from the brain trust in my effort to help out Rich with his 90 Z.

I scanned the motor last night and got no DTC's, almost everything looked normal when compared to our "reference" page in section 6E with the data snap shot.

The car has a miss, or so it seems or like it's stumbling, but when you get into the secondaries past about the tip in point it runs fine, no stumble.

Here are some of the scan data in closed loop @ idle that I thought was not too great, and by the book it appears not to be too good either when I looked it up.

Block Learn enable = YES. book says it should be NO.

BLM cell = 16 ???? book says it should be 0 - 1.

Left BLM - 127 to 128
Right BLM - 136

Left Integrator counts were from 127 thru 133
Right Integrator counts were 126 thru 131

MAP reading in volts was 1.5 volts which is out of the book range of 6v to 2v.

I told Rich that knowing that the Air & fuel filters, plugs & wires & PCV's are new, to check the plugs for color, check that the spark is good. I'm not too sure about me laying blame for the stumble on the primary injectors.

Oh yea, his tach is about 1k rpms fast, how do you fix that?

TIA

Tom