I believe my ignition coils are going bad. Everyone keeps felling me to swap one coil pack to the other to test it that way but on my 2002 deville I have the ignition coil pack to where I cant just swap it with the next one. Is there any other way to test them? I get random misfires and irregular idle and slight stumble when acceleration. Iv swapd spark plugs to ac delcos and swapd the mass air flow sensor because I was told it could be that. So now I believe its the ignition coil pack. Any ideas?