I had a Honda Civic that did the exact same thing. Would start fine if run daily, but a hard start if left over a weekend. Problem turned out to be sticking valves. The cure (which took some time) was to add MMO to the oil. I went pretty heavy and replaced a full quart of the oil with MMO.
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@(^.^)@ Ed
1977 Pearson P-323 "Dolce Vita"
with rebuilt Atomic-4
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