Missfireing irregularly

[Derpy]

So I've done the following to my vz v6 6.3l, 145,000km and still having irregular misfires but frequent

New sparkplugs
Cleaned the injectors in fuel (didn't test them)
New fuel filter
Cleaned maf sensor
New vacume tube (accidently snapped it)

It's not leaking fuel and had pressure in the lines

So I'm thinking of checking if the fuel injectors are working properly and checking the fuel pressure if it's not that It would be a vacume leak or coils?

 

[Jolls]

Fuel is one aspect to look at the the other is electrical. While you are there it would be worth checking the resistance of the coil packs - having said that if it is intermitent you may find nothing. Remove and clean the battery terminals and the earth points for the chassis and engine.

Probably best to do one thing at a time so that you can determine where the fault lies.

 

[Wats_in_a_name]

Have you done any scans for error codes?

 

[Derpy]

Have you done any scans for error codes?

Yeah nothing came up

 

[Derpy]

Fuel is one aspect to look at the the other is electrical. While you are there it would be worth checking the resistance of the coil packs - having said that if it is intermitent you may find nothing. Remove and clean the battery terminals and the earth points for the chassis and engine.

Probably best to do one thing at a time so that you can determine where the fault lies.

Yeah ill give it a shot, it's a very clean engine bay and haven't seen any corrosion but ill double check

 

[ephect]

If it's irregular misfire it's highly likely one of the coils is on its way out.