my truck is shutting off now mostly at idle or when coasting, but it will also under heavy throttle occasionally, and sometimes under light throttle. it is iying when i stop unless i put it in neutral and keep it above 1,000 rpms.

is has aslo stalled while driving when under a large elctrical load, like a/c on, stereo on, and rolling down both windows. when it stall i lose all electricity, the whole dash clicks off for a second.

i have a optima yellow top that is good, i just had it tested. no chip or battery light.

it seems to be based on either an electrical load, or at idle. i have problems in both situations.

 

You need to try and make some preliminary observation to start with.
Is the power lost to the dash, headlites and any other functions to see if it is electrical in nature.
If not then the engine is being shut down from either a loss of fuel or spark.
Then proceed in the direction indicated.
This covers a lot of ground so to speak but that is how you start.