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in my auto gear honda fit hybrid car, (mileage 56 000 KM) I had a engine tune up and changed my injectors (8 injectors) last month and after 2 weeks i started getting a slight knock (jerk or shaking). i remember i have had this once or twice in the last 6 month but it wasnt noticeable and looked like to be as a miss. anyway, now everyday morning when i start the car and drive for like half and hour or hour, it goes smooth and nice. and then in a while it gives the knock. (the time is not fixed, some days in 45 minutes, and some days in 30 minutes and sometimes in 20 minutes after first starting to drive it comes) The knock is like, when i stop at a traffic light and accelerate it comes. it only comes after a break or a stop and accelerate so it comes in low speed. then when driving with the knock, it gets a bit worst and knock (jerk or shaking) goes up, when i drive a little more it becomes more worse. then when i stop for few hours and start back then knock (jerk or shaking) is less and smoothness is bad. so i figured out this is something to do with a heat. when one of vehcile's part becomes very hot it gives the knock. so i went to a small mechanic and as advised changed my Gear box oil (ATF). it didnt fix the issue. then i took it to Honda company by when i got a check engine light and they told to run without the EGR valve, then i did it that and noticed that knock (jerk or shaking) is 50% less but car is not at all smooth. (it takes too much power and was hard) i felt so when driving. then they told to clean it the EGR and drive as the Honda company diagnosed EGR valve is causing trouble. after cleaning it didnt work, so as they told i changed the EGR valve which costed around 500$. And then my vehicle was super smooth and very very comfortable to drive. later after few hours of driving here comes the same knock (jerk or shaking). which confused me. apart from that the honda company told this is not a problem with gear box, (which means they told its not a judgger) Then i took it back to my local bass as he suspected it can also sometimes cause with fault fuel pump. then i changed that too. still the issue is not fixed. Now after having a small internet research i found this is a bit common issue, but only issue is finding the exact issue is difficult. Now i am confused what to do, Company told they will need to remove the transmission and see in the worst case. some times if its a damaged flyweel it can happen. so before taking it to any place anymore to repair i just want to get an experts advise here. Should i check in to these things ? Spark Plug Wires or Spark Plug Starter clutch ignition coil | coil packs motor mount flywheel I really appreciate any feedback that will help me to sort out this issue.