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About a week ago I decided to push my car to the limit on the highway to see what it's capable of. It preformed really well, but once I got off the highway and parked, there was a lot of rumbling/popping and vibration coming from the engine. Ever since then, whenever I accelerate there is a lot of rumbling/popping and vibration coming from the engine. How severe it is seems to be determined by how hard my foot is pressed on the throttle, and seems to pretty much go away after 3000-3500 rpm. What did I do to my car and how easy is it to fix?

I would suggest you may have split a hose somewhere and it is drawing in air.

You may have caused failure in the coils. It sounds like what happened to mine and that was the issue. For me, they were under recall (in the 2007 model) so it didn't cost me anything to get it repaired. You need to take to a dealer ASAP (since your check engine light is probably blinking because of it) and see.

Hi,
You have got a blown head gasket

You may have caused failure in the coils. It sounds like what happened to mine and that was the issue. For me, they were under recall (in the 2007 model) so it didn't cost me anything to get it repaired. You need to take to a dealer ASAP (since your check engine light is probably blinking because of it) and see.

Hi,
You have got a blown head gasket