OK jut watched a bit of how to replace coil packs. Car, PU would be easy access....Van...A bit tougher but could be done with loads of patience. Didn't look hard, but knowing the limited space in van engines....I'd call some shops, OR post a "Job offer" on craigslist of their labor gigs and see what the prices range.
Of course, the shops could tell you what it is for sure, the others would be a replace till it's fixed which costs more.