Have codes of random misfires and coolant system . New spark plugs and ignitions coils put in this year and ignition coils. Also water pump and fan replaced last year. Is the fuel pump failing? I suspect so bc there were times early in the yr car wouldn't start and there was black smoke in the rear. Not happening now though. Engine doesn't over heat. Ignion relay replaced this year. Whats going on ? Please help


Jeep sonetimes gets these lights