My mustang is a 2014 v6 premium auto...
mods. Roush cai, fp 3.73 gears, scr box tune. Car has 63000 miles and is an automatic...
Last week it was running really bad. Had codes p0304 p0315 p0204.
I put new plugs and intake gasket in friday. After this it still ran bad. A guy on a fb club said to do a crank relearn. I did amd it ran great. Until today. I went to leave for work and the cars was shaking bad. Like a misfire. I have not look at codes yet. But assuming they are the same.
1 is this common
2 what should i look at next
thanks