So I got the car on Friday. It was a one owner, kept in garage, regular service....etc. 120 K Miles.
Last night, driving home from work , I was taking the freeway. I got it up to 70 and was cruising on home. Slowed down to 60 when I hit some traffic and I just coasted there when I noticed a slight jerk. I looked over at the RPM's to see what was going on and went back to 60. What I noticed is when I get it right at 60 and let it coast there at 2K RPM, It will jerk ever so slightly, and the RPM's will jump. Not constant, just intermittent. It does it when going up hills as well, a little more constant.
I can't describe it any better. I drove it out last night again trying to replicate the conditions since my brother couldn't get it to do it. I took him with me and drove it down the freeway and got it to the right spot where it did it again. Just a little weaker of a jerk than before.
Questions: What the hell is going on with this? I think it's probably one of three things. First, low octane gas. I went cheap for my first fill up. I was going to grab some octane boost at Auto Zone , but thought I'd ask first. I lurk here. Second, plugs, wires general tune up issue. Third, coil packs gone bad. I know aleros tend to have this problem.
What do you guys think? Since I just got it last week, I can take it back to the dealer and throw a fit. I had it in once on friday for a minor annoyance that they fixed. I don't think they've ever seen a woman throw a fit like me, who knew what they were talking about when it came to service and technical issues of a vehicle.
Thanks in advance
Theresa