I was driving home last night from my parents place. It is approx 125 mile drive. Average speeds of about 60 mph. I was about 15 miles from home when bam, engine light started to flash, truck started to shake! I could still maintain highways speeds but when engine was under load it shook like a bastard. Was able to drive truck home etc... and to work today. You can feel misfire on idle and can definitely make it miss if put under load. Engine light is on full time and I pulled the codes and got misfire on cylinder 8,7, and 3. The truck is a 2012 F150 with a 5.0 coyote with about 60 000 miles? One person suggested a catalytic convertor? I was sure I would get more of an idea from pulling the codes but seems the misfire is all over the place?

See below reply! Any help would be appreciated!

 

Time for new spark plugs. Get it fixed ASAP or you will kill the cats. You also may have a load of bad gas.

 

Truck was scanned for codes. "random misfire", then misfire cylinder 7, then misfire cylinder 7 & 8. Then misfire 2, 7 & 8? Fresh oil, high test gas and plugs? Any suggestions?

 

Why are you waiting???? All the raw fuel is destroying yer cats, washing down yer cylinder walls and diluting yer oil.

You were already advised to Do ye plug change ASAP - Motorcraft SP519.

And change yer oil.

You don't need 'hi-test-gas'.

MGD