I get code 8L and 4C on my truck. sometimes its just 8L as soon as I turn it on and sometimes its that and 4c as soon as I hit the pedal. I have already replaced the dead man switch and cleaned everything up. sometimes it'll go hours without doing it and then it'll do it non stop. any suggestions? if I turn it on and don't touch anything for about 2 minutes 8L will also pop up if it already hasn't