Recently ive noticed that if i rev it up to about 3k rpms or so, when the needle drops back down itll go alittle under 1k rpms then jump up a little above 1k rpms, then drop down to like 500 and like sounds like its about to stall for a second, then itll go to idle and idle fine after that...figured this wasnt normal and was wondering if anyone has an idea wat could be wrong?? thanks

 

is your a/c on when it happens?

 

no, i know it happens when i used to put that on but this is with nothing on .... i was htinking maybe my fuel pump was going because its been makin a little bit of a humming noise lately.

 

I had issues like that when the alternator was starting to die on a couple of my previous cars. Nothing like that with by Cobalt yet though.

 

anyone else??

 

I took my car in for the exact problem was told it was normal due to my cai and they would not do a reflash because the tech was very persistant it was normal. walked out a 100$ richer though

 

lol what did you steal?

 

haha i meant by not paying for the reflash

 

lol doesnt seem normal but w/e

 

do you notice your lights get dim when this happens?

could be your alt?

 

yea my lights get dim for a second...****

 

Mine does this, it did it alot, then I got the stage 2, and it stopped, now its back again. Mines when the AC is on now though.

Idk whats up with it.

 

Lights dim because they are used to running at 14.4volts (your alternator) when the motor slows down the alternator doesnt put out as much current and therefore the lights drop lower towards 12volts (your battery)

Also, mine has done this since I bought it 3 years and 80k miles ago....its normal

 

ah thanks guys....relieved

 

front 02 sensor
dirty throttle body blade.
needs tune work.

 

Mine did that right before my throttle postioning sensor went out and I had to replace the throttle body

 

Most likely the culprit

 

not always.