Touge_Army

I just got an 89 coupe. The heads up display works fine when it is hot outside but when it is cold it takes 10 to 15 min to turn on. The check engine light comes on untill the heads up disply turns on than after that it disapears. If the head up turns on and I am stoped the check engine light will remain on untill I start moving that turns off right away. Any ideas?? Thanks for the help