tylermaly

I have an 06 king ranch and have changed the spark plugs and now having issues with what feels like the engine but could also be the drive train... The truck sputters when going down hill and it seems to shift fine but it does the sputter both up and downhill... Does anyone have any idea as to what this could be?

papa tiger

Needs isopropyl in the gas and a tune= A FUEL FILTER.

bleufox99

what spark plugs did you put in? I put autolite plugs in and after 5,000 miles got a what felt like binding under heavy acceleration and high RPM's. It drove me nuts. Finally put motorcraft plugs back in problem was gone. Some of the autolite plugs looked like combustion gases were escaping between the metal and ceramic but none of the plugs were broken or damaged or loose. I also had no misfire codes or misfire data stored in the PCM. I had also run a relative compression test and all cylinders read 100%

Masi1926

Do the coils too. The miss in my truck felt like the motor was coming apart. No codes came up either.

tylermaly

I put champion plugs in and my check engine light just came on... Ive also done some reading and am wondering about it being an O2 sensor..

tylermaly

Iv also recently changed my fuel filter

kobi

doubt its the o2 sensor. i wouldn't use champion in my lawn mower. make sure connectors on all the coils are all seated.

painthorseowner

x2 on the coils.....

tylermaly

Pretty sure it's coil packs now... It just started doing it at an idle

tylermaly

Turns out it was multiple misfires on 1,3 and 5 and now thinking its a vacuum line