im going out on a limb saying you eather did the mass air conversion or you have a cali car but you need to ditch the cobra cpu, from what i understand they eather take out spark or fuel at a some speed that i cant remember. other than that i would change to the gt 40 heads and 1.6 roller tip rockers. oh yeh, dont granny shift. 
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88 gt convertable =-= cobra intake, accufab 65 mm tb headers alum underdrives steeda alum.lca's, springs, c/c plates kyb struts
230 hp to da wheels
http://www.cybersteed.freeservers.com
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