Have you load tested your battery?
Today's electronics are great when they work, but go haywire in low voltage conditions. When you hit the starter, your battery (and system) voltage drops to it's lowest point. If the battery is weak, you may be dropping below the critical minimum voltage for one or more sensors.
I drove my non-computer 4.2 for 1 year with a dead cell in the batt. It started OK, but a touch slow. As another cell started to fail, my cheap radio would often lose all stored stations at startup. Usually only on a cold start, not often on a hot start. I knew it was a failing battery, but thought it would just quit rather than make the electronics act up.
It is worth checking, and costs nothing if done by an auto parts store.
418 miles on 19 gallons of gas. Can't beat the BBD !