okay so my cars throwing a code 4 and 5. this is on a 90 LS motor with the stock ecu. i cant seem to get rid of the code. i tried switching back to the stock ls dizzy bu no luck the car doesnt want to turn on. tried pluggin in my p72 ecu and no luck with that either. the car is under limp mode and doesnt rev past 3000. it only starts with my b16 dizzy. dizzy has a new coil and a new ignitor also. all sensors are hooked up properly except for my tsp. i havent set it to .50v @ closed throttle. but i dont think that is the problem. any ideas on what it can be? any suggestios? pls help..