I have a 93 Suburban that stalls intermittently. This just just started happening and had been running fine up to this point. If I let it sit overnight I am able to get it started again and it runs just fine for 5 or 10 minutes and then it stalls again. Right before it stalls the engine will start to run rough and then dies. I am not getting any spark or injector pulse after it dies. Any ideas on what direction I should go to further diagnose? Thanks.