Hello Scotty and all!

I recently found your YouTube channel, and I am glad I did. I am loving your videos. :)

I do have a question...

I only recently bought my first vehicle, a 1999 F150 4.6 v8 (~146k miles). Unfortunately it has started running rough over the past couple months. At the moment, the issues I am having are:

  1. When I hit between 40-45mph, with overdrive on, it starts to buck and doesn't want to accelerate. With overdrive off, it doesn't completely go away, but it runs much better.
  2. I have 2 misfires atm, along with codes for the o2 sensors. The o2 sensors, though, I believe is due to the previous owner having the catalytic converters removed.
  3. It seems that at odd times the transmission isn't shifting properly. It will either shift late or be a hard shift.
  4. With the A/C on, it almost becomes impossible to drive, seems to lose a lot of power.

I had the coil packs and wires changed about 6 months ago. At the time, I was told the spark plugs were fine. I had the misfires going into this, so that didn't resolve it. So I am wondering if the spark plugs did actually need changed.

A few people I spoke with seem to think that changing the plugs will resolve most of my issues, but I am not so sure. Then again, I don't know much about these kinds of things.

Any input or advice would be greatly appreciated!


Comments (1)
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Scotty Kilmer
Scotty Kilmer


removing the cats messes with the air fuel ratio and monitoring system. Doing that, all bets are off. I personally would not work on such an illegal vehicle here in texas as I could be fined doing so.