95 Galant stumbles on accel, worse when at normal operating temps, what gives?

Question

I have a 95 Mitsubishi Galant that I use for work.

It used to be that it would simply stumble at lower RPM's but when I got it above 2k it would smooth out and accelerate just fine. But now, I can barely drive the thing when it gets to Normal driving temps.

The car idles fine, 90% of the time. Sometimes it drops about 400RPM and sputters but jumps right back to about a 1000Rpm idle.

The plugs, wires and air filter are 2 months old, the cap and rotor I replaced yesterday, along with the fuel filter.

I checked the wires for arcing, but saw no signs.

The check engine light comes on, but not when this issue is present. For the last 4 days the check engine light has been off, but the issue has gotten worse.

I can hear the fuel pump working before I turn the key to start the car.

Tried some commercial Injector cleaner on a whim, nothing.

Checked the Mass Airflow sensor, it looks clean to me.

Any suggestions?

Answer 1

Just had issues with my '97 Camry....almost the same symptoms....when I would push on the gas there was hesitation, sometimes it seemed like there was also a dead spot in the accelerator, turned out my O2 sensor was about to die.....Replaced the O2 (oxygen) sensor, now my car idles better, no sputtering, no hesitation....

Answer 2

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