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  1. C

    4.3LX TB IV timing advance issues

    Thank you. I have a cheap timing light but it works. I was going to go back and try to make the marks a little more readable cause they're tough to see. I wouldn't have guessed 8 BTDC but thats a good place to start.
  2. C

    4.3LX TB IV timing advance issues

    I have a '89-ish 4.3LX with a Thunderbolt IV module. I was having issues that appeared to be fuel related, changed the carb to a brand new Edelbrock 4bbl, I have new wires, new Quicksilver cap, rotor and pick up (plugs aren't that old) Boat starts and idles beautifully, shifts and idles in and...
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