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How are the battery cable ends on the car?
Could be a bad connection that by having the jumper cables hanging on them is helping it to get a better contact (for full starting current) or the wire itself perhaps ?



Take the bolts out of the cables, clean the pocket behind the bolt head, if there is more than one wire in the connection take them all apart & clean everything....I've had a few GM's have this sort of failure...



Yep, forgot to mention the part about taking the bolt out and cleaning that too..One Camaro I had, couldn't get it figured out. In the end I just sliced away the plastic from around the terminal end in frustration and wire wheeled the end and bolt and other cable, and it worked perfectly after that..