I like the compression to be within 10 PSI of each other, if they are not the idle may be rough. 100 is low because of the one that is 130 this will cause a rough idle. check the adjustment of your valves and retest also do a wet compression(squirt oil into the cyl 2-3 squirts) test to determine if the rings are bad or the valves are leaking or burnt. If the compression comes up a good bit the rings are bad if it stays the same the valves show that they are bad if it was a low cylinder. Timing, if not set right could be a problem, but not as bad as a burnt valve
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