My truck ran like shiat when I used the Autolites. It seems to be hit-n-miss as to which truck likes them and which doesn't.

 

well depending on which lot number the batch is they could be made by any of at least three different manufacturers in either china,Taiwan, or mexico so no surprise.... when I bought some autolites for my vw I had two different batches of plugs that even though were the same part # were different and made in two different countries.... they are all knockoffs as far as I'm concerned...