Hi Guys, Usually idle control problems relate to the Idle control Valve, which is located under your throttlebody. If you look carefully, it's got 2 small hoses going into the valve , and depending on which model, it's either 2 going in from the same direction, or 2 going in like an L shape. As it gets older, it can get gunked up with bad ****. It's a $500 brand new, but 2nd hand i scored mine for $110. If you go to a non-toyota mechanic, you can ask the mechanic to take the part out, immerse it in diesel or petrol, and let it soak for a minute or 2 to clean up the drit. Look at the first few lines to see what it looks like here. http://picasaweb.google.com.au/TiangC/2ZZGEEngineSwap Labour, it's about 15 minutes to install, and about another 30 minutes to drain any bubbles in your coolant. so say 1.5 hours toyota time. Nothing wrong with thermostats, etc, as the idle is controled by this valve, and any idle problems should start looking at here. BTW, Addzz, good to see another MR2 spyder owner. Mines a 01 model too. Where about are you?