Just wanted to let everyone know that when you use the search function you can find the answer to you question (usually in multiple threads and with multiple opinions). I did this and I think I have fixed my hesitation problems.

The Back Story.
For the past month or so my car has been hesitating horribly off the line, and when I put any amount of strain on the engine (Think 2k rpm in 5th gear or anything below 3k in any other gear. Eventually I got frustrated with it when in 1st gear I could bearly move and I pushed it to WOT. BLINK BLINK BLINK goes the CEL. I finally caused my #1 cylinder to misfire.

Over the month my gas milage also started to go to shit. I went from 350mi on a tank of gas to around 225, and I live in SoCal where CHEAP gas is $2.15/gallon. I had a similar problem with my Accord a few years ago and decided to change the spark plugs, instant success, or so I thought. The car ran perfectly for the next two days, then slowly but surely, the car reverted back into it's crap ass performance.

Finally I decided to consult the powers of the 2gnt geniuses. So I search for "hesitation" and BAM I get thirty posts, with about 25 different causes for hesitation. I looked through all the symptoms for all the causes and decided that my O2 sensor had gone bad on me.

So I went down to Autozone (it was an urgent trip, I couldn't wait for shipping from nopi) got a sensor and their loaner tool, put the car up on jackstands and started to work on the car.

The old O2 sensor was in there friggin tight. I tried the tool, but I couldn't get all my force going the right direction and the socket slipped off and snapped the old sensor in half. Well good thing I was gonna replace it anyway...

so I started working the sensor that was screwed into my exhaust manifold... it wouldn' budge so I sprayed some WD40 on it and waited an hour.

Still no movement. so I Decided to warm up the car and try then.

Still nothing. so I decided to break out the 22mm 16inch long wrench to try to break it free.

After about 20 mins of putting as much weight as I could into it, the bugger finally decided to move about 40 degrees. I had found my window, so I started to roll it back and forth getting a little more movement each time. It took another two hours to get it all the way out, and when I saw the sensor out of the manifold, my stomache dropped to the ground.

There were about 1/4 of the threads still on the sensor, the rest were in the manifold! I had to literally strip the thing out to remove it.

Luck for me though the manufold still had all its threads and a few passes with a steel brush ceaned them all out. I then installed my new Bosch sensor. The really hard part was finding the correct wiring.

the stock sensor came with 4 wires, 2 white a gray and a black, and the new sensor came with 4 wires, 2 black, 1 white and one blue. wtf?!

I did some research and found that bosh has 95% of the OEM O2 sensor market so odds were that my OEM was a bosch. so I went to bosch.com and found out that they use something like 6 different wiring color systems and they had a pdf on installing an o2 sensor that had a chart with all the different color combinations and their corresponding colors! I hit a gold mine.

So I wired it up , reset the ecu and the car has bee running lie new for the past week.

thank you 2gnt search for suggesting the o2 sensor!

1997 Eclipse RS

YAY For you. See nOObs...Search button does work.

I eat emo kids for breakfast

1995 Eagle Talon (SOLD)
72' SuperBeetle
72' Standard Beetle
56' Deluxe Beetle