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Hey CF, I'm looking into ways to up the performance of my 17 iM. I found the "Performance Chips USA" chip that boasts increased everything, from gas mileage to horsepower LINK . The worry I have is that it's only $58, and that sounds WAY too good to be true. Has anyone else used them, or used...

Hey guys, just bought a used Corolla iM this past weekend and having a few issues I wanted to see if you all had seen! 1st - At idle it stays at 1k rpm for most of the time but every like 10 seconds there's a 3-5 second period where the car drops to 500 rpm. Then it hops back up to 1k rpm...