I have a 89 chevy.it keeps on losing spark and wont spray gas at the injector.they both happen at the same time every time.then u let it sit over night or take out batt.it will start to work and run great for two or more days then happens all over.so i checked wireing to comp.good connction there.so i changed the comp.thats what i was told it was and ran good for two days and happined all over.help please dont know what else to try.thank you.