Engine started misfire all at once...no warning...read the code it set..p0300(misfire) and p0302 (misfire #2 cylinder). Engine has 90'000+ miles. I replaced all the plugs..still misfired but the p0302 code went away..tried swapping coil pack on #2 cylinder with another one..no change...now its setting all sorts of different codes from MAF sensor...Rich on banks 1&2...throttle sensor...being from the "old school" tried the dollar bill at the exhaustpipe and was shocked to see it flapping but mostly sucking in...Exhaust valve maybe???? IDK...any help would be greatly appreciated!!! THANKS

 

Out of my league. There's smarter guys here. But...have you looked at it in the dark? Might see arcing/sparks. The "all at once" makes me think of a spark going astray.

 

if you had a misfire on cyl 2, why did you swap the coil on cyl 1 ??? makes no sence.
try swap the coil on cyl 2

 

lol...im sorry i typed it wrong ...i did swap # 2 coil thanks for pointing that out...=/