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Old 09-23-2022, 10:10 PM   #1
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Default 1998 SL2 Extremely Sluggish Acceleration


I have a 5 speed manual 1998 Saturn SL2 with about 210k miles. Recently it's acceleration has been extremely sluggish, especially when going uphill. On flat ground it can eventually get up to freeway speeds. It happens in all gears and maybe a little worse when cold, but occurs when the engine is cold or warmed up.

Based on other thread searches, I have tried the following with no significant improvement.

* Replaced the front O2 sensor and ECTS
* Removed, cleaned the EGR, and reinstalled
* Temporarily removed front O2 sensor. Car continued to idle normally and still had sluggish acceleration. I read in another thread that if this fixed the acceleration issue then it would have likely been a clogged catalytic converter. But, the acceleration issue remained for my car.
* Temporarily disconnected electrical connection to EGR. Car continued to idle normally and still had the same sluggish acceleration. I read in another thread that if the acceleration issue changed without the electrical connection, then the EGR may be bad. It didn't change for my car.

Additionally, the car had been idling high (~2000rpm) for a while until I removed and cleaned the throttle control valve about a month ago, prior to the extremely sluggish acceleration issue. The car now idles around 900rpm after warmed up, maybe around 1100rpm when cold.

Any more ideas of things to try to diagnose the issue? Or what else could be the cause?

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