Mr

[Addy]

Hi guys I have owned my 64 plate chrystler ypisilion for the last 4 years. It has never given me any issues, last week I took my car in for a service the mechanic advised it has reached 80,000 would be good to replace the timing belt. Its been changed drives fine but later engine management light will come on reading faults of a misfire cylinder 1 and 4. The mechanic has checked the timing everything is fine. When the engine management light comes on there is no power. Can someone help please 

[Deltamike]

Quite probably coil pack or wiring loom fault.  New plugs might be an easy start.  You could swap coil packs to 2 & 3 and see if the fault changes with them.

Edited April 18, 2022 by Deltamike

[Deltamike]

Sorry, that should be possibly coil or loom.  Easy stuff is worth trying first, new plugs and swapping coil pack leads.  If the misfire remains it's not plugs.  If the misfire goes from 1 & 4 to 2 & 3 then the leads might be faulty.  After that it's a bit more digging.