Im not sure if anyone said anything about this
it isnt really a glitch i suppose just something not deemed as cheating
in atleast one mission i was driving a car i hated and always had flat tires so i decided to hop out get another car "PCJ" and head to the spray shop..it worked i went back got the target car then went right to the end mission drop off...if this isnt upto par mybad im new here =D