04 V6 LS vibrates at idle, knocks under load and smells funny :)

the codes kept showing a misfire # 6 cop or spark plug. The #6 plug has been changed atleast three times. That's why I bought Six new cop's and spark plugs. Took it to a reputable shop and he charged me $245 to put them in...Drove great for one day then the cel came on and it was a #5 misfire. I pulled out the plug and unhooked the battery. hooked them back up and it was fine. the next day, I stopped to get gas and when I started driving the cel came on and went into limp mode. I took it back to the shop. The mechanic looked at it and said the #4 spark plug was misfiring so he switched around the cop's and plugs, said it fixed it and runs great.

I left the shop again and on the way home it drove real rough, so I took it back. He said this time Might be the fuel filter and the catalytic converters. He changed the fuel filter, the passenger and driver side catalytic converters plus both upper and lower 02 sensors (FOUR total)...he called me and said the car is fixed and runs fine, but the cel is on and shows a #2 misfire. He said he's done all he can with my car, so good luck...I supplied all the parts, he just did all the labor...since they were my parts he didn't waranty anything. I spent $1400 total...With his parts and labor it would have cost me $2700...That's why I supplied the parts and risked the no waranty...any ideas???

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