While ruuning on the road suddenly check engine light turns on and RPM becomes unstable even jump, s up and down. With out any engine.

My corrola 16 valve 1.5 efi runs smothly but sudenly while running check engine light turns on and rpm becomes unstable jump, s up and down while engine does not take, s any accleration, and engine stops sundenly. While when I m trying to start it it just start it for a second or to then again chek engine light turn, s on nd engine stop, s. While making a noice lyk thap. Both on patrol and cng. According to my mechanic I replaced advancer and imulator, plug, s, plug wires, checked whole engine room wring to efi card. Tuned up my engine, throtel body every thing still the problem remain, s the same. Kindly help me on this that what is the exact issue.