1997 f150 4.6 it misfires on #1 and #8. it shakes like crazy at any speed and idle. I have new plugs,wires,coil packs,and new injectors in those two. I have good compression,spark,and fuel. What could it be? no engine light on but pulled codes p0301,p0308,and p1151

 

P0301 = Misfire cylinder #1

P0308 = Misfire cylinder #8

P01151 = Bank 2 Sensor 1 slow switching / no switching

Bank 2 is the driver side cylinder head and Sensor 1 is the O2 sensor closest to the exhaust manifold. Bank 2 contains cylinders 5,6,7,8.

If the engine is rough then this pretty much confirms a misfire.

Have you cleared the codes and does the engine run smooth once codes cleared.

 

Lean misfire from a vacuum leak maybe?

Heres 2 of the pinpoint tests that I show for your missfire codes:

1 Vacuum leak in air intake system.
2 Fuel injector circuit malfunction.

Theres more, but these are the most likely considering what you have allready replaced or tested.

Have you checked for a vacuum leak on the intake runners for 1 & 8?

 

Moved to proper forum. (Your truck isn't a 2009 F150 Please double-check when posting.... thanks.