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Originally Posted by fatlazyless
...hi again....am having mechanical problems with my old truck including the catylitic converter.....if this truck, a 1997 f-150, were just one year older then it would not be subject to the NH exhaust emissions standards......thankyou NH legislature.....will be in touch as soon as I figure out how to get it fixed for cheap... 
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My 1998 Dodge Dakota with 243K miles would not pass emission test either. A retired mechanic told me to mix Marvel Mystery Oil in my gas and my oil. In a couple of tankful of gas, it should pass inspection. Sure enough! He was right! It even stop the smoking when I first start the truck.
Also there is a leak somewhere in the evaporative emission. The check engine light is on. Just before I go in for inspection, I would disconnect the battery for a few minutes. guess what? The inspection machine did not notice!
My Dad and my Grandfather swears by that stuff (MMO). During WWII the govt use to buy tons of that stuff and it is regularly used by the armed forces motor pool.
Give it a shot. Shop around and you should get a gallon of that stuff reasonably priced.