engine failure

Ok ere goes I just put on new head gaskets, new spark plugs, wires, cam and crank sensors,waterpump, and fuel pump and sending unit and fuel filter. car will only run for about ten minutes then die and wont start fo another 30 minute to an hour what else could it be any ideas would be great and if you need more info give me a hollar.

oh yeah and I wanted the car running retty quick so I did leave out the egr seal but it ran fine for 2 weeks and you couldnt smeel to much exhaust coming out from it but the car will run for about 10 min though and it is real good and stong you can let it idle or let it run like you are driving it it will shut off between 5-10 minutes.

oh yeah it is a 94 sc with automatic tranny