'03 Suburban stallin.

I have an '03 Suburban that has started stalling when stopped. I had the codes read and got P0134,P0135, and P1516. The O2 sensor(p0134 & p0135) is easy enough to find and repair. The P1516 code can be either the TAC module or the wiring to it. The question is, just where is the TAC madule? Thanks.

What engine?

The throttle position control module is right rear side of engine compartment near fuse block.

Better get a good scanner and good repair manual out for the repair on it.
Let us know how it goes.
Good luck

The truck has a 5.3l vortec engine. Thanks for trying to help.

You are welcome.
Let us know how it goes.

Checked all the wiring connections. Turns out the problem was a dirty thottle body. I removed it and totally cleaned it and truck runs great.

Thanks for posting back how it went.
Good luck