I have a 2004 dodge ram 1500, 4.7 magnum, automatic transmission, 166700 miles. I bought the car at an auction i know it probably sat in the lot for sometime. The car idles rough and rides a bit rough. Has a hard time going over 60. I changed the O2 sensors, spark plugs, and coils. I checked the compression and they are as follows (C1= Cylinder 1) C1 138, C2 135, C3 145, C4 152, C5 145, C6 160, C7 147, C8 149. Ive been told it could be a valve seal, engine composite clogging up the engine, fuel filter, fuel pump. Please Help. P0300 reads multiple misfires. 

Thank you for all the help from some of your previous videos on youtube! They have taught me so much!