[DML] Idle gradually increased to 1700 RPM during warm up
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[DML] Idle gradually increased to 1700 RPM during warm up

This is a never before seen problem on my car during my 16 years of ownership.  I went to start the car this afternoon , it had not not been driven since the DMCMW open house weekend  3 weeks ago.   The car fired right up as usual Idle was stable at 775  +/- 25 with a very subtle hunt but virtually stable.  I walk away from the car after 20-30 seconds  I'm letting it warm up.  I was  getting a few things from the trunk of my other car to put in the D. While I had my head in the trunk of the other car The RPM starts to gradually increase on the D. I did not think too much about it Figuring that the Idle Micro switch might not be tripped. I walk back over the D get in driver seat  to see the IDLE is at a steady 1700 RPM .  I tap the Pedal a few times  NO change. OK, I Go back to engine bay to make sure the Micro switch is depressed. It IS. Then I happen to Look down at the Left EXHAUST HEADER. This Is a JET-HOT coated system.  The header starts GLOWING and IS increasing rapidly.  I do a quick check of the Right Header which appears to NOT be turning colors at this point. FYI I was in a rather dark building at the time so it was fairly easy to see the heat GLOW.  Well I've never had this happen before. and As the header starts turning very RED rather quickly , I Shut it down immediately.  While the engine was shutting, down I hear a woooof sound in the exhaust, almost like I flame igniting.  The exhaust header quickly turns back to normal color. I wait about a minute then start the engine again. Idle is steady at 1700.   The scary part for me was the Left exhaust appearing to be much hotter than the right.  Again I did not notice the Right side turning color as the left did.  This is a STAGE I exhaust.  both sides are independent each with a CAT.  I thought about the possibility of maybe a plugged CAT but I'm not so sure about that.  Any thoughts of what may have caused my idle to increase like that?



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