i have a question when ever i drive my car around and its all nice and warm whenever im slowing down to stop i put it in nuetral and the car is at about 1500 rpms and then when i slow down to about a stop it jusmops to about 1800 rpms then when i sit for about 15 seconds its goes to about 1000 or 800 rpms is this normal or not i tired adjusting the idle adjustment screw but it didnt work any suggestions will help thank you

 

does the idle bounce around or does it jump up to 1800 and sit there perfectly?? You may want to consider going by a shop for a compression test. One of my friends cars would do something similar but instead of jumping up his rpms would dip down and bounce around between 300 and 2000. He had a blown seal and it only did weird stuff like that when he was on the brakes or sitting at a light. Another thing it could be is just the way your car is tuned. My cars idle is really weird and when i had it tuned, all that stuff went away. This is all just my opinion and advice, i'm not an expert or anything. I hope you find out what the problem is and get it fixed without too much hassle

-Brent

 

it goes up to 1800 and then when i stop it goes to 1500 and then slowly to 800 and 18 vac