Sounds like a horse!

[icE]

Every so often, when i turn off the car the engine goes putt putt putt putt putt for a few seconds after. There's probably an obvious reason why this happens. Any suggestions as to how to fix it?

[3A-C Power]

That's called dieseling, or run on. It's caused by preignition of the fuel from the heat in the cylinder. Compression that's too high due to carbon buildup can cause this. Also the book lists incorrect ignition timing as a cause.

[icE]

Probably carbon build up. What do you suggest to clean the carbon up?

[GTSSportCoupe]

I had a problem with dieseling on mine for a while too. I found that when I brought my idle speed down a bit to about 950 rpm (I had it too high at 1100rpm), my car stopped dieseling. Don't know why this helped for sure.

As far as decarbonizing goes, there are a few different methods floating around. I'll let a couple of the others who have good methods expand on this. What I do to PREVENT carbon buildup though is: run good clean gas. If you have Chevron in Florida, use their 91 octane or so. It has cleaning additives that I find to keep my engine nice and clean inside. Also, run some fuel system/carb cleaner through it once in a while. Most importantly though, keep your car well maintained. Check and replace if necessary: air filter, fuel filter, spark plugs, plug wires, distributor cap and rotor. Make sure your timing is set right, and all your engine systems are running properly. Also, feel free to rev your engine high at full throttle every now and then when accelerating. (Hard in an auto though I guess).

[icE]

Ah revving hard isn't hard in this auto, just shift it to neutral right before it's rdy to switch gears, and then drop it back down to D

[tercel4wdrules]

If you want to rev up an auto don't you just have to floor it and it will downshift?