Ugh. JB+ problem.
So... I picked up a used jb+ for cheap yesterday online. Didn't wana spend the money for a jb3/4 and would have been more than satisfied with the 40 hp gain the jb+ offers.
So I install the jb+ (simple enough) and when I reconnect the battery and start the car it automatically starts shuddering and rpms start jumping. When you put it into drive it starts jerking horribly and after a few moments CEL comes on and it goes into limp mode.
The car does not have these problems when jb+ is disconnected.