Glad to hear things are better. That being said, i doubt the TFI had much to do with your improved pulling smoothness. They really are more like a switch than anything else. They either work or they don't. They can alternate from not working to working, but it's rare that they would effect low rpm "smoothness". The 2 degrees of timing, and the plugs, are probably the parts that deserve the credit. Plugs that look good still can have damaged electrodes inside the porcelian (sp?) where you can't see it, yet it has an effect. Honestly, just moving your plug wires while swapping the plugs could cause the effect you mentioned. Either way, I'm happy for you that it's better now!
Take care,
-Chris
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