I just bought a 94 k1500 with a 350 tbi for cheap and its doing the same thing, only mine will only blink out code 22 which is low voltage to tps. However tps is brand new. I will be working with mine to try and figure something out, I will be testing the egr system tonight along with the intake gasket with carb clean.
Ended up being a fuel pump that was only putting out 3 psi. Replaced with new and my truck runs excellent now.