well, I work at a dealership, and sometimes we get cars (not so much in th epast several years with todays EFI) from out body shop that have been down there a while. they will foul out the plugs cause of starting it only for a minute to moe it across the shop soo many times as it progress's to the diff. people in the shop. most shops have several employee's that do several diff. stages of the repair. not 1 person that workes on it start to finish. so it could get started/moved/started/moved a dozen times or more w/o ever being running for more then a couple min.s at a time. Id say, drive it around the block, listen carefully for noises, make sure the alignment is straight and it doesnt pull AND that the steering wheel is straight. then go down the main road, then onto the freeway to help clean up the comubstion chambers. dont need to do anything special, just normal freeway driving is fine to clear it all out and burn any unburned fuel out of there.