Hi everyone I have a 1999 daewoo matiz, everytime I start in the morning it drives well but after a few minutes it suddenly jerks and the check engine light comes on at the Sametime and if I switch it off and on again' it drives well and after a few minutes it does the same thing all-over again, I've tried all obd scanners but all cannot connect to the vehicle's ecu. Any ideas what could it be, any help is appreciated.

Distributor not advance spark timing according to engine speed/rpm and making engine vibration during acceleration and deceleration. I have adjusted distributor setting with timing torch which was 5 degree according to engine manual but engine making vibration during acceleration and deceleration, when I adjust distributor 10 degree the car runs smoothly but the pick up of car is low. I think spark advance timing is not working, please tell me its fault about distributor, ECU or distributor adjustment issue. And how to check these issues.