Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
A small amount of resistance in the battery positive voltage to the PCM may cause a no-start. The PCM grounds will cause a no-start only if none of them are making a good connection. A loose CKP sensor may cause an intermittent no-start by moving away from the reluctor wheel.