Engine is misfiring or jerking. How to get to back 3 spark plugs?

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Had all plugs and coil packs replaced 5 years ago. Noticed brown fluid in area and on plugs in front of engine. I had to pay $900 last time I worked on these because I let an auto service do the back three plugs. Problem back than still wasn't fixed by them. I replaced one coil pack on front after I got it back and it ran great.