The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something...
the coipack...you know the thing the sparkplugs come out of....loss of power at random times...no acceleration but at other times the car runs fine
new coilpack'll set you back $120 new but i got...
no cam sensor signal to pcm with crank sensor signal present. check for 5 volt ref and ground at cam sensor connector. scope cam signal. most likely cam sensor defective, hall effect type sensor