What cylinders are 4,5,6?

I've replaced the fuel filter, plugs, wires and no help.

I'm wanting to swap the coils around and see if I can get 1,2,3 to fail before I buy new coils.

Thanks

Swapping at least one of the coils & spark plug wires is a good starting point.

However if that doesn't work?? then having the exhaust back pressure checked on the drivers side would be the next thing to check.

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