Just to add last night I did mention I had two leads swapped over and it did one miss fire before I shut it straight down. Is there anyway it could have shunted something to do with the chain and maybe damaged the tensioner?
I was reading about TC problems with the Buick and it does seem that the factory chains are fairly average. What I also read, and have noticed over the last 2 or 3 weeks that the power has dropped off slightly. Soon after fitting the CAI if I booted it, it would really come alive but not now, not so much. The new rockers certainly brought some power back but that was to be expected. I thought I was imagining that the power had dropped off but now I am not so sure. The other thread did say they noticed some power loss, when the chains were knackered.