GMC Repair: gmc internal secuirty system?, gmc safari, safari van

Question
Hi Manfred, my name is Luis and i have a 1999 gmc safari van. I have been having problems with the van not starting, after you run it for a while (it never shuts down on its own) and you turn it off it does not want to start. I was told to disconnect the battery cables for a while then start it and this seemed to work for a while, now it takes many hours before this works. I took the van to a repair shop and they cheched everything and said that some of the fuel injectors where bad and needed to be replaced. Then later I was called back and was told that their was a problem with the secuirty system with the van. They have had the van for three days and still can not tell me when it will be ready. Do you know how this prob can be repaired?
        Thank you for your time and patience,
                             Luis Olvera

Answer
Hi Luis. I'm affraid i need a lot more information. Does it spin over normally, is this a fuel or an ignition problem, which the garage should already know by now. How does it run when it does run. I doubt very much that the fuel injectors all went bad at once, how many miles. what engine, what is the fuel preasure? I can certainlyhelp, but i need these answers before i can help you, good luck, Manny