I have a 2007 F150 with the 5.4 Triton V 8. I began having so rough acceleration from 40 -50 mph. I learned that this could be caused by faulty plugs and coils so I began to replace them. I replaced the plugs and coils on cylinders 1,2, 5,6,7,8 but waited to do do cylinders 3 and 4 because you have to remove the computer. I began to get p0304 codes every once in a while, but waited until I had enough time to do the job right.
Last weekend I took my son to Fort Worth and back, a trip of about 3hrs each way. On the way home I had three misfires P0304, P0303, and P0300. My truck began to accelerate poorly and it began having trouble accelerating quickly and behaved as if the transmission might be slipping.
Today I changed the cylinder 1 & 2 plugs and coils and no longer have any codes. But I still have the acceleration issue, but only when I try to accelerate quickly. The Rms will go up until the gear changes and there is a weird noise. There are no issues in accelerating or gear change when gradually accelerating only when you floor it.
Where do I go from here?