2001 Ram 5.9L engine light, alot of info on the truck

2001 1500 Ram 5.9L gas engine
Problem is that when i'm on the highway traveling 60+MPH, alot of times my engine light will come on and blink, some times the truck will start to shake(like the road is bumpy) the shake will go away if I increase the RPM's sometimes it comes back once the RPM's go steady sometimes the shake won't come back for awhile. The engine light will turn off if I let of the gas for a little while. Sometimes the engine light will come on if I get into the gas real hard but other times when i'm just cruising along. Never comes on unless i'm on the highway. Also I can here a very distinct metalic tinking sound my guess is its a peice of metal in front of the catalytic converter from when I got it changed, but i'm not positve.

What I have instaled on the truck is:
MSD 6A ignition
MSD blaster coil
MSD plug wires
Ram air hood
High flow magnaflow catalytic converter
Flowmaster exhaust

I don't know if one of these things has to do with this problem, I kinda did everything together so its hard to pin point if this problem started after one of these things were installed.

I hooked a computer up the truck to try and read the engine code, the code wasn't in there unless the light was on, it was hard to drive 70mph and work a computer at the same time, but I manage to get something about cylinder 5 misfire, but the truck never seemed like it misfired. Also when I had the computer hooked up I checked out the O2 sensors, the sensor - B1S1 the fuel trim% jumps anywhere inbetween -5.46 & 4.68, but the O2 sensor - B1S2 the fuel trim% is a steady 99.06. The voltage on both sensor change around but are different at the same time.

Any help would be much appreciated. I plan on doing some long distacne traveling soon, but don't want to take my truck with this current conditon
THANKS