I have a 94 buick la sabre stalls when warm has spark no fuel pressure also loses power to power windows and locks,when car sits it will start and windows and locks will also work.runs a little while and does same thing can you help? i have already changed computer fuel pump egnition module

Take it to a qualified repair shop , it's fairly obvious you have no automotive diagnostic skills .

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Probably a faulty fuel pressure regulator or plugged filter.

try dumping some gas line antifreeze into the tank

first scan for any codes if it comes up po 300 just a guess it could be random misfire puts the car in limp mode . the igniton modual underneath the coil pacs the coils sit on could be redy to go or if not that check fule pressure by puting fule pressure guage on shrader valve located on fuel rail on top of injector assembly and check fule pressure with fule pressure guage. car of key on pump reading should be around 48-55 key on car on reading should be around 55.minus -3 to 10psi = reading of 38 to45 only if the fule regulator has vacume line atached to it on fule rail dubble check psi reqirments in car manual for co mpleat accuracy. If it doeint have vacume line pressure stays constant 48- 55psi

Check fuel pressure.

It is possible but unlikley. I would see what you are loosing/ spark/ fuel pressure first. I would not tear it appart until you have a better idea of what is going away. Usually something to look at would be the ignition module and crank sensor because they can both be affected by temprature. Good Luck

check fuel pump pressure.it should be 41 to 47 psi.

Have you checked fuel pressure? How about spark on all 6 cylinders? Maybe a coil?

Its the distributor module. The module in the dist. that tells the plugs to fire. When it gets hot it shuts down till it gets cool again. Had that same problem on several cars.