Expedition repair

The fuel pressure test should be done under load not at idle... rev the engine up as quickly as u can and make sure pressure doesnt drop

We drove it with the gauge on

Does this have a mass air flow sensor?

forgot to mention I replaced that as well

Low power conditions under heavy throttle like this are going to be fuel related or a restricted exhaust or timing problems. vacuum leaks and o2 sensors wont cause this

Ok I guess I'm going to look into timing then. Thank you for the info

Plugged up catalytic converters?

They were just replaced in March... I'm going to check the temp just for the hell of it though

The o2 sensors are not used to trim fuel at full throttle. The mixture needs to be richened up not leaned out. The sensors will still produce a signal tho

No codes

If you did not fix the cause of the last ones going bad the new ones could already have gone bad too. A back pressure test is best. If there is a bad misfire it will ruin the cats!

Upstream O2 sensor data under heavy throttle can be used to identify direction. High voltage above 450 millivolts suggests it is not a fuel issue but possibly a exhaust restriction. Extremely low volts < 0.100 millivolts suggests its not getting enough fuel

There isn't a misfire though I disconnected a couple coils yesterday while running to check with test light because I replaced some pigtails and wanted to make sure they were wired right and only then did it throw a code which immediately went away

Do u have a code reader to scan for codes. Shooting parts at it usually gets expensive fast.... check for misfire codes and other related codes... and at wide open trottle the O2 sensors are disabled. So it can’t be that. Clogged cats are possible and sometimes they don’t set a code.