03 x-type 2.5 has a miss fire only on cold start and gives code po300-06.after it warms up no miss fire codes but code po430 but runs fine. i have changed plugs,maf sensor,water temp sensor, imt o-rings,pvc hose,fuel filter.my guess is vacuum leak but cant find one. are there any hidden hoses iam missing? is there a sensor that directly control cold start? any info will help.