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Originally Posted by Iflylow
First, thanks for including all the info about what engine, how many miles etc. So many people don't do that and it is impossible to help them without that info.
Second, RUN RUN RUN from that dealer! It is NOT normal for all the warning lights to come on! They are there to alert you to a problem, not to make your dash look pretty.
The ABS light can be caused by a variety of problems, but I would check the brake fluid level first. Second, the wheel speed sensors are known to go bad in these (and other GM) cars. There have also been problems with the wiring harnesses going to the wheel speed sensors. You will normally get ABS, Trac Off, Low Trac and maybe Brake lights with a bad harness.
If the hiccup is caused by a misfire, plugs, plug wires or coil packs are the most likely culprits. I would start with the plugs and wires first, since they are cheaper than coil packs and easy to do yourself. A misfire would also cause the Check engine light to come on.
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I took it back in so that the mechanic at the dealer I purchased the car at could take a look at it. (Warranty and stuff). He was able to determine what some of the problems were. The Check Engine Light no longer comes on. He fixed this problem by doing something as silly as changing the gas cap. Now that's something I've never heard of before.
The hicups still occur, but I'm told that it's caused by dirty injectors. I've been using an injector cleaner since I bought the car after reading some suggestions on the forum the day I got it. The check engine light doesn't come on anymore, which is a good sign, but the car still hicups. If it's the injectors, does the injector cleaner stuff you put in the gas tank really work? I've put it in twice so far, each time I filled the tank.
I'm really happy that the Check Engine light is gone now, that was worrying me the most. The next problem I have to address is ABS, Trac Off, Low Trac lights that are lit up. I haven't seen the Brake lights light up though. The switch on the console has no effect on or off either. If the problem is what you said with the "wheel speed sensors" or a "bad harness"; Are those expensive things to fix, and are they reasonably easy to diagnose? The mechanic didn't seem too overly concerned about that and said to bring it in next week and he'll take a look at that too.
Thank you so far for your help. If it wasn't for this forum, I wouldn't even have a clue what to ask when going to the mechanic.