No doubt this has to do with some computer issue. I have the above described Chevy. I posted something earlier on about how it has a "missing" problem. Since that post, I now only drive it around town. (To afraid to go much further with it...) Here's what bugs the bejezers out of me. Sometimes I can start it up and drive it to the store or my folk's house and it will run perfectly. Other times, I start it up and it runs like crap from start to finish. The one thing I have noticed is if I punch it, it will get up and go without any problems. If I start off from a stop like I'm supposed to, it will spit and sputter right along. I paid a station here to find and fix what ailed it. The machine, of course, only shows "random misfires". DUHH! They checked this and that and put new wires, plugs, cap, etc. and charged $350.00 for that tuneup. I came and drove it home and then to a store and low-and-behold, you'd have thought they hadn't even touched it. It ran just as crappy as ever. One day, I had a daddy-daughter-date-day. We were going to go to a town about 35 miles away. I took the Blazer (for some reason) and the dang thing drove _perfect_ all the way there, around town, and back again! So~ tuneup, lots of gas treatment, new fuel filter, other things "checked", and I'm still left wondering, Thanks for your previous responses, any other ideas would be greatly appreciated!