My 91 camry won't start, checked it and no spark. I replaced distributor assy (it was full of oil), ign coil & plug wires. It starts and I ran a road test, 2 miles after on the highway--it stalled. No start, no spark and I let it sit for half an hour then I try again, it fires back up. I replaced the igniter. It ran fine for all my afternoon errands. I drove to school for class and after being parked for over an hour, it won't start again. After several tries, it fired back up and got me home. It started fine the next day but I don't drive it anymore until it's fixed for good. Check engine light does not come on after car is started. Tried to get codes, but Check engine doesn't blink (jumped T & E1, in Neutral and operating temp). Is it an ECU problem?

If you went aftermarket on those parts, they're most likely still the problem. Very common with Honda and Toyota.
Other common stall issues are coolant temp sensor and EGR valve sticking.

Maybe the ignition igniter is breaking down? If so, replace it.