89GT351

Hello everyone I recently bought my first 2003 SVT cobra. Everything is good except for the idling problem I am having. Here is what's it doing I use this car as my daily driver in the morning when I fire it up it would idle at about 1300 rpm which it should until the engine warms up and then it should go down to about 750 rpm right? well it does not do that not until I shut the car off and start it back up again then it idles as it should around 750 rpm. Once the engine is completely cooled it does it again I will have to warm the engine up and then shut it off and fire it back up and then it would idle just fine. I only had this car for about 4 days and it did that since the day I bought. It only has 9800 miles it does have Accufab throttle body, some unknown air filter, aftermarket radiator and intercooler everything else looks stock. Please someone help me. Thank you

Blackvenom01

ive heard many people having problems getting there aftermarket throttle bodies tuned good for idle...it also might not be tuned for that...i would find a tuner that could look at it for you and see where that idle is coming from....goodluck hope you love the new car congrats

massmustang02

Check your plugs too. They may not be gapped right. Also depending on the type they are, some have been known to cause rough idle. You should be around .028.

89GT351

I am probably going to replace the spark plugs I just need to know what type do you guys recommend? I don't even know why would the previous owner change the throttle body? the whole engine is stock minus intake, throttle body, radiator, and intercooler I don't think that throttle body helps. I bought it from an older lady her husband used to drive it until he past away she just wanted to get rid of the car. Even with this idle problem I still love this car.

mfj

For your setup, NGK TR-6's

massmustang02

+1. What I have for my setup.

89GT351

I just ordered those spark plugs. This morning I took the idle control motor off and cleaned it a little bit and also wiggled some of the vacuum hoses I think it idles a little bit better, I don't know it might just need a good tune? Does anyone know a good cobra tuner near Louisville, KY?