02 Blazer no start.
 

Hello. I have a 02 blazer that will not start. It ran fine and I I got out on interstate and went to speed up it lagged but then went fine. 1 week later same thing. Over 70 and the Service light blinked. Next day it lost compression at red-light and wouldnt accelerate with gas pedal on the floor. Then just like nothing it started running fine for 20 minutes. Parked came out an hour later drove it 2 miles. Same thing. Got it home changed plugs wired distributor cap and rotor. Started right up ran strong for 6 seconds died and hast ran since. Plugs,wires,button, cap, fuel pump,filter,spider valves, pcv valve,maf sensor, map sensor all replaced to no avail. Will turn over but no start. Oil pressure sensor too. What now? Im out of ideas and thrown too much money at it. Sorry so long but I had alot to explain.

What codes are stored?