I've searched around to find if anyone has had the same problem as I do with my car, and have not found any. My Car: 1994 Civic Hatchback DX, swapped with a d16z6 and manual trans, along with all wiring harnesses. I finished the swap back in late August, and it has ran perfect, loads of power compared to the stock d15 and auto trans. But when it came to early October, I was having problems with the idle and power, this started while I was driving on the highway. So let me describe the idle/power problem. When I drive the car its runs perfect, but then suddenly the car almost cuts out, sputters a bit, then holds the idle at 1000k, even when the car is all warmed up. Whenever it idles like this, it runs pretty powerless, and it super sluggish when I start driving in first gear. Also, sometimes when it runs like this, I can hear some little pops coming from the back of the exhaust, something that doesn't happen when it runs good. I felt like the car was clogged up somewhere in the intake, so I sea foamed the intake and cleaned the IACV, and the problem still remains. Also looked to check the o2 sensor, but it seems to do nothing whether it's plugged in or not. I'm kinda lost on this issue, just wondering if anyone has experienced this or why I should check to fix this issue. Thanks!