Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
Hello! My name is Gary.Welcome to JustAnswer.I'm reviewing your question now, and will post back with a reply shortly.
Sounds like you have some intermittent misfiring going on.
First thing to do now is have the valves cleaned from carbon buildup, especially since the inlet manifold has been off.
Very common for foreign matter etc to stay trapped under the valve seats.
Please only fit genuine coils as well.
Do you need any further help?
I hope my advice has been of assistance to you.