I have an 02 silverado LS with 5.3 motor. I have had it in the shop twice to have them fix a no start problem and they have failed and I can't afford another $200 part swap. So here is whats happening: I can turn the key to the start position and nothing happens except the instrument lights will go on. THere are no relays clicking and no noise from the starter. This only happens about 4/10 tries when its cool. The ignition switch and the other part of ignition have been replaced. Sometimes you can hold it in the start position for a few seconds and it will start and sometimes jiggling the key will start it. Is there something being overlooked. The odd thing is it only did this once at the repair shop so they were not sure of problem.I could not find any threads like this one, thanks for any help.