Have a 2015 f 3 with 3000 miles on it. Did a 170 trip Saturday prior, went to take out of garage and would not start with out having to twist the throttle. Would only stay running with throttle cracked , dealer said might be fouled plugs, they can not look at till the 13 th. Saw some where about having bad vaccum lines on athread but can find it. If some one could point me in the right direction on where to look for these to check would be appreciated, wife wants to ride