I have a 97 Eclipse RS automatic , my car idles at around 1300 -2100rpms when in park "even as high as 2500 with the air conditioning on , when i change from "park to drive it feels super rough on my transmision i have to turn it to drive with my air conditioning off so it doesn't feel so rough, anyways another huge problem is when im stoping or moving at realy slow speed "0 -10mph and i have my foot on the brakes the car will buck realy hard , it will not buck when im cruising or when the car is totaly at a stop but anywhere from around 20mph or less when im stoping it will buck realy hard , recently after the car "bucks" it turns off , the weird thing is when the car bucks the rpms are around 1000rpm and it just will buck and shut off. When i am cruising if i let off the gas the car will not slow down also , the idle has been set lower and i have reset my battery and the problem keeps coming back. Do you think a vacuum leak is causing all these problems ? bad egr ? bad sensor ? ?? Help please .

 

Anyone have any ideas ???[&:]
Thanks.

 

97 Eclipse RS High Idle Problem HELP !!!I have a 97 Eclipse RS automatic , my car idles at around 1300 -2100rpms when in park "even as high as 2500 with the air conditioning on , when i change from "park to drive it feels super rough on my transmision i have to turn it to drive with my air conditioning off so it doesn't feel so rough, anyways another huge problem is when im stoping or moving at realy slow speed "0 -10mph and i have my foot on the brakes the car will buck realy hard , it will not buck when im cruising or when the car is totaly at a stop but anywhere from around 20mph or less when im stoping it will buck realy hard , recently after the car "bucks" it turns off , the weird thing is when the car bucks the rpms are around 1000rpm and it just will buck and shut off. When i am cruising if i let off the gas the car will not slow down also , the idle has been set lower and i have reset my battery and the problem keeps coming back. Do you think a vacuum leak is causing all these problems ? bad egr ? bad sensor ? ?? Help please .

I have a 1999 Mitsubishi Eclipse GS, Automatic, and I'm having the same problems you mentioned above.
Were you able to fix your issues?
I've replaced the coil pack, spark plug wires, spark plugs, IAC, throttle body, air filter, EGR.
Any help would be much appreciated!

 

Replace this part and all problems will be solved. I did and the result is great!