I recently installed a Howell TBI kit on an 83 Scrambler (258 I6)along with an HEI dizzy (with some help from you helpful Jeepers
When I ran before the TBI on the old carb I could run all day long. Now, with the TBI, the engine starts right up and runs really smooth (650 rpm idle) for about 8-10 minutes then dies. If I drive it, same thing. No indication of it dying (no stutter, sputter, or rough idle) it acts like it is on a timer!!!
Howell pointed the finger at the ignition mod. which I upgraded to an HEI, same problem.
Funny thing is I am getting NO CODES on the check engine light diagnostic
You guys have helped with everything I have had an issue with so far, I hope someone can throw me a clue on this one