i think im going to sell my 1991 f-150 and get an older f-150 or f-250 my engine is shot no power smoking black and blue put to mutch money ito it alredy loking into a 1967 f-250 351

 

If you would quit being hard-headed and just read the codes then maybe we could help you fix it. It will sell for more money if it works right.

 

So...... you think a 40 year old truck will be in better condition than a 20 year old truck? There's still no can of 'magic' that you can pour in the gas tank and make it run right.

If you can't pull codes on the 91 so that the forum can help you figure out what's wrong, how the heck do you plan on keeping a 67 running with no diagnostics at all? (You have to actually know what you're doing to work on those)

For crying out loud - run a jumper and see what codes you get, and we'll figure out what's wrong with the truck you have.