2007 Ford Focus ST, the problem is plastic and metal contract and expand at different rates so they either have to do all metal or all plastic. The fix is a larger all metal throttle body or use a dremel to increase the opening around the butterfly so it doesn't catch. Basically the butterfly gets stuck in the closed position so stomping on the gas forces it open.
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Edited by oxI Sonic Ixo: 9/17/2015 7:55:04 PMDamn man, sorry to hear that. I have heard awesome things about the new focus STs. Their so quick for its class and price, I wouldn't mind picking one up second hand to play with the ecoboost and its tune-ability. Could care less if it's Forward wheel drive. I wouldn't have imagined they would skimp on the performance model like that.