'95 Surbuban Engine Problem

'95 throttle body 350 4x4 auto. Engine runs fine till you put a little pull on it like going up a hill or small grade. Begins to miss, once it downshifts it does come out of it although sometimes it seems to surge up and down a pit. Could this be a sensor or distributor related? CEL comes on shortly but never stays on for any length of time. Auto places said they can't check codes unless CEL stays on.

Welcome to AF. They can check for history codes on that truck, find a way to do that first, their basic scanner will not do this, this could be a fuel problem or an ignition problem. BTW, we have a Suburban forum in the Chevy section, next time post there.