Anyone know what might be wrong??

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Old May 11, 2010 | 05:14 PM
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Default Anyone know what might be wrong??

My 98 z28 has been surging badly and randomly reving up, mostly when it first turns on but sometimes even when im driving, I am not sure what this could be. The coolant temp. sensor was put on because it didnt have one before and right when it was put on the problem started. Has anyone ever heard or had this problem before?
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Old May 11, 2010 | 05:16 PM
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Vacume leak
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Old May 11, 2010 | 05:16 PM
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ses light on??... what codes are being thrown??
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Old May 11, 2010 | 05:21 PM
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it needs more cowbell.

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Old May 11, 2010 | 05:24 PM
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Originally Posted by brian_rs/ss
it needs more cowbell.

LMAO
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Old May 11, 2010 | 05:37 PM
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check everything that was touched when the sensor was installed, could be a bad sensor, why was thre no sensor in the first place?
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Old May 11, 2010 | 05:37 PM
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ses lights been on for a while since I put the headers on, last time i checked the codes thats were being thrown were the o2 sensors (from the new headers) and the coolant temp sensor was messed up, changed it, and the problem started
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Old May 11, 2010 | 06:29 PM
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Sounds like O2 sensors are bad. My 99 SS did the exact same thing when one of the sensor went bad.
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Old May 11, 2010 | 06:36 PM
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front o2 sensors yes, rears no... he said he has o2 codes from the header install which are more than likely the rears, so that won't create a driveability issue... the coolant temp sensor can cause problems... did you clear the codes and do an idle relearn after you put the new sensor on?... if not, i would do that and go from there
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Old May 13, 2010 | 07:19 PM
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I got the codes cleared and it idles fine now when i turn it on.. But when im driving the car surges and it bucks. Sometimes when I stop the rpms go up to about 2000 and back down and back up over and over.
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Old May 14, 2010 | 04:52 AM
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my 98 formula did that for a while after i had the sensor replaced. i think the computer is just trying to figure out if the sensor is actually working again. mine stopped doing that after like 3 or 4 days on its own
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Old May 14, 2010 | 11:00 AM
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IAC sensor is probably what's causing your issue. check it out
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Old May 15, 2010 | 04:32 PM
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I took the sensor off and its running perfectly fine now, has something to do with that, either the sensor is messed up, wiring could be messed up, or the computer needs to get used to the new sensor.
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Old May 15, 2010 | 06:40 PM
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chances are the computer needs to get used to the new sensor
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Old May 17, 2010 | 10:57 PM
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clear the comp and turn the car on and it should work just fine within 30 seconds.

good luck
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Old May 18, 2010 | 03:24 PM
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Check the temp sensor connector for corrosion.. I fought my 5.3 truck tooth and nail for forever before I found a corroded temp sensor plug that was causing similar issues.
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