Hello all,
I have a Triton V8 4.6L with 114K miles that has been running great until the past couple of weeks. When I am cruising about 50-55 and try to accelerate the truck hesitates and eventually after 3-4 hesitations will reach the 70MPH I wanted to get to and continues to run fine. There are no problems accelerating from 0-55.

Nothing has been done recently, I need to replace plugs and wires as everything is still original. But, this problem seems to be more than plugs and wires. Air filter has about 5k miles on it and is relatively clean.

I've seen posts on the web related to problems w/ IMRC runners.

Any help would be appreciated.