own a 05 f150 5.4 triton,last few day been dealn with dead battery,got new one and on dash it say CHECK GAUGES,then goes away in few mins,starts up fine,then when put in gear engine shakes and knocks pings ,put in nuetral it stop or just idleing with foot off the gas,till u depress pedal lil bit ,it starts back up,then goes away and runs fine,today i was otw to work when it started but never stopped,made it back home,hooked computer up and gave 5 codes poo21,po174,poo21,po174,po340,i bought 2 cmp sensors and still knock and run rough,i kincked the pcv hose and noise almost stopped,i removed pcv valve and thought there is a check ball or valve in there but can see right thru from one end to the other,it doesnt sound like a rod or valve,there is no other codes showing,could it be broken plug or one or both knock sensors can do this need andvice from one of you proffesoinals thanks

 

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