Engine studdering at 1000-1400-rpm. Then when passing at 67mph got a engine light on dash. Engine seemed to be firing, just couldn't accelerate. Acceleration issue only happened one tim. Otherwise just engine light flashing. Here is Camobd2 reading. First time using device like this so not sure whatit all means.

P0308 CYLINDER 8 MISFIRE DETECTED.
Freeze frame:
Fuel Sys 1 OL-Fault
Fuel Sys 2 CL-Fault
Calc Load(%) 89.02
ECT(F) 195
STFT B1(%) 0.00
LTFT B1(%) 19.53
STDT B2(%) 0.00
LTFT B2(%) 19.53
Eng RPM 4342
Veh speed mph. 67
Spark Adv. 11.00
IAT(F) 73
MAF (lb/min) 20.66
TPS(%) 37.65

 

It means that the #8 cylinder spark plug or coil needs replacement.

 

After replacing the coil on 8 I am getting much better gas mileage. I took it for a long drive and only noticed one hesitation a few times, all at once down in the 1200rpm range. No issues when passing.

 

How many miles are on the spark plugs? If 60k or more, change all of them.