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just wondering if anyone knew why or had this problem, my cougar revs up and down sometimes when i start my car goes from 500 to 1500 then back down then up etc.... but its fine as soon as i put in in gear
 

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Reset your computer by pulling the negative terminal. Could be a problem with your idle air control too.
 

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It could be anything from your AIT to your ECT. It sounds like 1 or more of your sensors is reading incorrectly sending incorrect info to its ECM. It could be that one of your sensors is dirty or malfunctioning(double check anything electrical).
 

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Sounds like what mine did. Try a new MAF( I know they aren't cheap) and a new IAC. (Also not cheap) If not? Then you have a faulty sensor somewhere. Reseting the PCM will only keep it away for awhile. Check the ECT and ACT. Good luck!
 

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my car will just do that for the first couple times after disconnecting the battery or when the battery has a crappy connection.... its always worked for me
 
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