98 tahoe

i have a 98 tahoe that wouldnt turn over buy key ... but with a jumper wire to the starter would turn over and start fine ... so i thought it would be the ignition switch .. so i swapped the entire steering column out... and still the same thing but now it turns over and kind fires or stumbles and dies .... so i swapped back out the column and still the same ... any ideas ???? thx in advance!!!!!

Proper testing before throwing parts at it.
The starter circuit has to go from ign switch threw neutral saftey switch and threw a relay and fuse before mking it to the starter.
Get a test light and a wiring diagram and find out where it is losing starter signal.
MT