Greetings all,
New to this forum as a member, but have used valuable information in the past. I'd like to share my recent experience with this issue. I have a 2003 Grand Caravan with 127,000 miles on it and recently have had the missing and lack of power issues stated here. I am the original owner and have done all the maintenance since day one. I changed the plug wires and plugs and that solved my issues but the reason I am posting is because when I went to change the plugs, three of them were loose! I could have spun them out by hand. I have no one to blame here except me because I was the one who changed them at 76,000 miles. In all my years of working on cars I've never had plugs become loose on their own. The only thing I can figure is I never tightened them in the first place. Or maybe the heads were too warm when I did it. Point being I probably could have simply tightened them and the problem may have gone away (compression leaks), but I wasn't taking any chances considering the mileage. Please take the time to check this first and maybe you'll get lucky as I did without needless expense. By the way the van is running great. Good luck!