Are you touching the gas pedal? Nobody does that with the remote.
Don't know how John's diesel truck works but both my former Ford F-350
diesel and John Deere tractor diesel had glow plugs. I didn't have a
remote starter for either. In the truck you'd turn the ignition key to
"on" and a glow plug light would illuminate. You waited for it to go
out (only took a few seconds) and then you'd start it. On the tractor
the procedure to start in cold weather was to advance the hand throttle
control to almost full throttle, turn the key to the left for about
15-20 seconds that would heat up the glow plug and then turn to the
right to start, with your other hand on the throttle arm. As soon as it
fired, you pulled the throttle back to idle.
I don't even know if John's truck has a glow plug.