Had my truck stall and die twice while trying to reverse to park? Changed a coil this morning so no codes are showing.

 

Any idea's?

 

Throttle body may be dirty... Iac in the throttle body could be sticking..... If you clean the TB then clean your MAF too.... If that doesn't work and the truck runs great aside from the reverse stalling, I would check for a vacuum leak. If you don't have any codes it could also be the FPDM in the spare tire area.... If this little box looks corroded then that could it as well...