Ok heres my problem my 91 740 will only start if you hold the key stiff in the on positon for aprox. 6 seconds while cranking but it starts very rough and if you turn the car off and try to start it normal without holding it there that long it wont restart or starts but dies what could this problem be i had the radio relay replaced a few months ago. i appreciate any help. also sometimes when it starts and i take it out of park it dies could this be related to one problem.