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He did state that it only happens under two conditions. Should get an evap code if the cap/etc is leaking. His van will not have an EGR either.
 

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Common Sense + Critical Thinking
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I had replaced it early on along with a multitude of other parts at the same time. the TSB states that if you change the CKP, you need to 1.) check the Depth for proper clearance and it make require 1 or 2 shims and 2.) check the timing cover for damage, if cracked, replace. my NEW CKP didn't come with shims so I had no idea about SHIMS. 1 shim, no codes, no misfire. Do yourself a HUGE favor, check it... mine had hairline scratches on it, that you could barely see, so it was making contact with the reluctor ring. FYI, I know you have a specific P0302 code, but I did too. I think it was b/c that cylinder had the most, but if you hooked up to a scan tool that can monitor, most if not all cylinders, would misfire.
I was thinking along these lines as well, wondering if the CKP had been changed without checking/shimming.
 
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