2000 Disco. The last time I drove my Disco, less than a mile from home something felt off as I came to a stop at a light. Upon trying to accelerate I rolled forward like I was not pushing the gas pedal. After a second or two I felt/heard what I would describe as a pop/thud, almost like I hit a very small pot hole. It seemed to come from the engine compartment on the drivers side. Immediately after the sound, full acceleration was back and the check engine light flashed 3 or 4 times and then stopped. Ran like normal after that.

The codes I pulled:
P0455
P0134
P0300

I plan to check the gas cap in the morning and look at ordering O2 sensors. Any other advise? Thank you in advance.

 

I bet the O2s will solve the latter two codes but the first one is odd. You can blow smoke in the purge line and see if it comes out under the truck, and / or replace the purge valve (use the Hyundai one). But it seems unlikely that oxygen and a purge valve would both act up at the same time. And no go with gas pedal? What the heck. That sounds more like a giant vacuum leak. Were the O2s already planned for any reason?

 

Youre on the right track. Better replace the plugs and if you get a chance replace the wires too if you remember the last time you replaced them. Yesterday I had multiple misfires and went worse. My truck wont even start this morning. Just starting alone, the engine light started to blink. Replaced them today and runs smooth, no hesitation.