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Hello, Did you find out what the issue was? My car is having very similar issues. I was coding P0016 and P0017; knew it had something to do with my timing. Also, my check gas cap sensor would show up periodically. I changed the crankshaft sensor. Now, it slow starts (purrs once it starts though), knocks on acceleration (like yours), and my tachometer isn't working properly. I'm thoroughly confused...
 

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I'm a little nervous...I just bought an 08 this week, drove off the lot, discovered it has a brake light issue, fob didn't work (not battery), headlight went out, back door doesn't lock when using key fob, had to put a new sensor on wheel, have that annoying popping sound, and today tried the cruise with no luck! It sounds as if these might be common issues for the g6. I thought I had done some pretty good research from reviews, etc, but now realizing there are lots of issues. One of the guys are dealership seems frustrated at all the issues, but it's not like I broke the darn thing. I love driving it, it's fun. It's only got 62k on it, I did buy an extended aftermarket warranty, hopefully it will cover most of whats wrong if the dealer ends up telling me tough luck. I have an appointment on Monday to get the taillight situation fixed and the steering column fixed also under recall. Hoping I can get the cruise and popping noise fixed also. For those of you who had the intermediate shaft replaced, did that fix it long term? Thanks for your help, I'm hoping for some encouragement, I think the car is adorable and like the way it drives, just bummed, I feel like I bought a big problem...:(
 

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I had a 06 GTP and I have a 07 GT that both have that same popping noise described. It has bothered me but seeing how people have reported this going back many years I'll attribute it to an inherent flaw in the car.
Also, my 06 had 100k before I got rid of it, and my current has 130k, leaving it alone doesn't seemt to be a problem.
 
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