Engine Mechanical problem
1992 Cadillac Seville V8 Front Wheel Drive Automatic 150000 miles

My car runs great, starts up first time. It doesn't over heat but when you first start then drive it for a little while till it gets warmed up then shut it off. Then right after I try to start it and it turns over but wont start! I leave it set for about an hour or two and then try it and it starts right back up no ploblem. Also sometimes if you drive it for a hour or so especially if it is hot out side then it starts lunging forward while driving and then all of a sudden the tach start jumping and gauges start going crazy and looses power. Then dies and wont start but leave it set and it will start right back up in 2 hours or so? Do you have any idea what would cause this? Thank You!!