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I often times have trouble starting the car with intermittent power at the coil.

What's telling you the coil ain't recieving steady voltage in ign2 (crank)? I would pull the yellow "ign" wire off of the starter relay to disable the starter and have a helper hold the key to "start" and you under the hood, seperate the 2 wire dist pickup connector & drag/tap the male end of the eng half of the connector to the intake (ground) & see if that makes the coil to dist (dist end) of the secondary wire held 1/4" from ground produce steady sparks. If good that eliminates all except the pickup & tho a pickup can test good when cold then act up when hot this is happening cold so might be easy to pin down. The gap is good right?

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