don't bother with the compression test. it's useless. last year my 89 had no power at all. did a compression test 4 cylinders were 135 2 were 125. only took 3 cranks to build pressure on all cylinders. with those numbers i should be fine. anyway i pulled the motor and the 2 cylinders that had 125 had cracked top rings. so much for the compression test. i've read that a leakdown test is much better. thats my .02
Like I said you are looking for variations from the rest. So in your case the 2 cylinders that read lower readings than the rest had a problem.
You can also have your engine computer (EEC-IV) do a compression cylinder balance test for you after the KOER (key on engine running) test mode. The following describes it:
EEC-IV Cylinder Balance Testing Procedures
After you have performed the KOER test and corrected any problems you may now perform the EEC-IV Cylinder Balance test. This test checks all the cylinders in the engine for matched compression ratios. The Cylinder Balance test is designed to help isolate cylinders that have low compression ratios with respect to the others in the engine. This test is performed immediately after the KOER test has finished displaying codes.
To perform this test, the EEC-IV will bring the idle of the engine up to about 1,000 RPM. Once the idle has stabilized it will then shut off spark and fuel to one cylinder, during this time the decrease in RPM will be measured. The EEC-IV will then activate fuel and spark to the cylinder being tested, and will wait for several seconds until the idle stabilizes again. At this time it will repeat the process for the next cylinder, repeating until all have been tested. The results of the test will then output one or more of the following codes to your reader:
• 10 - Number 1 Cylinder Low
• 20 - Number 2 Cylinder Low
• 30 - Number 3 Cylinder Low
• 40 - Number 4 Cylinder Low
• 50 - Number 5 Cylinder Low
• 60 - Number 6 Cylinder Low
• 70 - Number 7 Cylinder Low
• 80 - Number 8 Cylinder Low
• 90 - Passed Cylinder Balance Test