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I have the exact same problem as you're describing, devonkyle77.
For the most part my idle is stable. Every once in a while it'll fluctuate abnormally, especially if I've been driving the car a little bit harder.
Usually, as long as I keep the rev's down I won't have a problem, but once I hit ~3,000 rpm in 3rd, 4th, or 5th gear the car will start bogging. If I hold the throttle constant at that rpm range in those gears I will loose power. As soon as I let go of the gas and reapply the problem will go away temporarily. However, after a few seconds it will come back. It sucks, especially during long road trips because I have to constantly give gas, let go, give gas, let go, give gas, let go, etc.
I have replaced the headgasket (unrelated, and the problem occured before the replacement), spark plugs, recirculated the BOV, replaced the Knock Sensor, replaced the fuel filter, checked the MAF, checked the TPS, checked the O2 sensor, reset the timing, and checked for codes (none).
So far none of these have solved the problem.
Next up, I'm going to check compression, replace all the gasket on the exhaust side, and check the injectors.
I have an S13 blacktop, btw.
Let me know if you find anything that solves the problem.
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