[rpbenisek]

my windstar is missing and with a code reader PO305& PO174 keep coming up eventhough the suspected misfire is no.5 i changed all the plugs and plug wires and even the coil and an still having the miss. it seems to come and go but is getting worse.when driving it might smooth out and than instantly go into its rough idle mode and miss , i'm suspecting maybe a sensor is the cause . i have replaced the maf sensor a year ago and did the TSB 171&174 isolator bolts and intake manifold and plemun and it worked great without the codes coming back other than the now miss and present codes. hope some body can get me to the right direction on what to do or replace , replacing sensors are expensive i suppose the process of elimination works but would take forever and again be costly.i'll clean the MAF again and see what results i get however i did this just a few months ago as routine maintainance, i know things can fail at any time. any possibilites on the TPS , CMP or CKP? HELP-HELP!!!!