What year is your car. If by judging from your name I'd say it's a 92 and unless a complete moron had the car before you, it should be a Mass Air car. If you don't know, look under the hood where the air filter is and follow the hose from it, if there is a silver thing with a black cap on it before the throttle body, than you have Mass Air. If there is just a hose from your air filter to your throttle body, you have speed density. Also, 87-88 cars except for a few 88's were all Speed Density. 89-93 were Mass Air. Hope this helps.
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My 94 GT
[This message has been edited by fordmanck (edited 06-07-2001).]