see, i can't say for sure b/c i was not able to visually inspect it. i can only make a educated guess at it. when i got the car back it did this weird thing at idle...it would shake and kinda do a bouncy rpm thing. i thought this could be injectors, tps, and a bunch of other things after checking all those...and having them check out fine...it was still odd. then a few nights ago it got worse...would do it no matter what when idling. saw the crack...i never saw anything like it before...so i dunno. maybe stupid thinking to think this is the cause of it, but it seems like it should be. so they either didn't inspect it close enough...or they did it while installing the engine. either way...someone should have picked up on.