Ganassi giving Spencer the #42 car to qualify at the Glen is just a nice way of saying, we don't want you here this week. He probably didn't find out he wasn't going ot be qualifying his car until he got at the Glen this weekend, and after realizing he was getting stuck with junk, didn't even try qualfying.
There was a similar situation last year, when, actually, the same Ganassi team car, the #01 Cingular car of Jason Leffler then, put in a road racer for the same race, and gave Leffler a back-up car to try and qualify. The car was crap, of course, and Leffler ended up missing the field. A few weeks later it was announced that Leffler would not be returning...