Question

I have 2 codes on my pickup P0357 and P0303 and I don't have any power over 55mph

Answer 1

Hi there,

The code P0303 is for a #3 cylinder misfire, this could be due to a bad ignition coil or the spark plug.

P0357 points to an issue with the ignition coil on cylinder 7, this may be causing a problem at higher speeds as it will also cause a misfire on cylinder 7.
Here is some good info on the 357 code:

P0357 FORD - Ignition Coil 'G' Primary/Secondary Circuit Malfunction

Read more: https://www.autocodes.com/p0357_ford.html