I am a new 2005 roadster owner and I just love the car. We ( wife and I)purchased the car this spring with 33,000 miles on it and as we drive the car more we have found that the car will stall or will idle very rough after a quick stop. Is this a problem with crossfires or am I experiencing something strange. Any help toward solving the problem is welcomed. Bob

 

Are you using 91+ octane gas?

 

Hmmmmmmmmmmmmmmmm..... my dad had a car DECADES ago with an automatic transmission that would stall if you stopped quick and it would barley idle when cold.

It was the transmission - think of it as not fully "pushing the clutch in" when the car came to a stop. I remember he'd often put it in neutral while waiting for a light, then go to "D" and press the gas as soon as it "engaged". It was an old Pontiac, I think he sold that car rather than try to get it repaired, as it had many other problems leading up to that one.

Is this what you are describing? Or is it that the engine just isn't running right?

 

Small vacuum leak? Do you have code scan reader; has it thrown a code?

 

Yes we use 91 octane and it is just like your fathers car and I have not seen any type of code. Would the code just appear or do I need to get the code to read out? Bob

 

Stalling in general can be the start of a bad crankshaft position sensor....common problem with these cars in that mileage range...

 

Unless you live in Calif.,Hawaii, or Alaska, most good Auto Parts stores will come out and scan/read it for you. Apparently we can have a code w/o the check engine light coming on, although I haven't experienced this with the Coupe yet. In addition to checking in here with the gear heads on this Forum like you've done, checking for codes is a good starting point for troubleshooting/diagnosis. As you're hearing here, it could be a few different things.

 

If this was the problem it would be evident when sitting in drive as the car would be fighting the brakes and the OP does not mention this. The RPM's would tend to be higher, as these cars will adjust to engine load to prevent stalling. So I'm guessing an engine management problem of some kind.
I'm guessing the idle speed is not being maintained properly. Vacuum? TPS? Something in the throttle system?