This is a hyster correct? Swoops last post makes me think no but the thread is under hyster ft.
Regardless I had something similar on a gm powered Yale recently. Coil pack cured it. Not saying this is what your problem is but it was for me. I know you say it's good but just saw this thread and thought I should chime in.
When you can't find a problem, fix what you know is bad. As swoop said the cam sensor can do strange things.
Edit: I had no codes displayed.