cynlinder misfire all 6 in v6 engine?

i have an acura cl 3.0 v6 vtec. my engine light is on so i checked the codes. the codes came up that all cylinders 1-6 are misfiring. machanics have given me some possibilites like the coil, a sensor, or minor things like the spark plugs. every year i do a complete tune up it will be fine for a while and then the same thing. also randomly the car will run a low idle when first started and will stall. i had another acura the same exact car previously and that one was fine..i am completely clueless and so isnt everyone who looks at it...it is a complete mystery..has anyone else had this problem or know something about it..anything will be helpful

How did you wind up in this forum, post this in the ACURA FORUM.