mrounds06

i went to autozone and got my car scanned due to a check engine light. I threw 3 codes P0442, P0401, P0300. I searched for the vacuum leak and found a hose that was off. I was just wondering could the random misfire be due to using champion spark plugs as opposed to motorcraft? I was told this could be the cause of my poor gas mileage. And what should i do about the insufficient flow to the EGR? All info is appreciated.

mustangman03

might be the DPFE sensor where was the vacuum located that was lose

5.0 85 GT

if you have a misifre find out what cylinder it is...change the coil pack on that one and get all new 8 sparkplugs from Motorcraft..well the motorcraft ones i mean.. i did that and it solved my issue, woke the car back up and got better gasmileage.