Diagnose stalling and poor performance

Brought Chevy Astro van in on April 6th after having another shop install an electric fuel pump. Upon leaving the other shop the vehicle stalled a number of times creating a very dangerous traffic situation. The van did need a fuel pump but after the other shop completed the work the problems really started only after leaving and going a few blocks. I had managed to pull over and call them (at 4:45pm) and was told they could do nothing but told me of Walt's. Being only a few blocks from the shop I managed to get the van there where I was told they would check it out the next day. They contacted me prior to closing at 12:00pm and said it was more serious than first thought. After a series of tests etc. it was deter- mined I had not only a computer problem but injector and alternator issues. Long story short, they fixed everything and got the vehicle back better than new and even made an "adjustment" on my bill to offset the time it took to get it right. Thanks to Steve who didn't give up and saw it through to completion! Gratfully, Dave & Laura Ocala, FL