2005 Ford Escape, 4-cylinder with ~75,000 miles. I experience engine misfire when driving on the highway after 1+ hours that only occurs when I’m going DOWNHILL. The misfire will last between 36-41 seconds and then goes back to operating fine. Doesn’t occur on every downhill and doesn’t occur on steep downhills during in-town driving. The diagnostics always show the error for cylinders 1 and 4. The following repairs have been made:
Replaced all 4 spark plugs and ignition coils, replaced fuel filter, fuel injectors cleaned and tested showing no concerns.
Misfires reoccur during next long drive 6 months later, compression test performed and failed. All four fuel injectors replaced and one connector replaced.
Misfires reoccurred again during next long drive 4 months later.
I am stumped as to why the problem keeps happening, why it only occurs when going downhill, and why it seems to last for a fairly consistent length of time. Any thoughts or suggestions would be appreciated.