2000 Kia Spectra starting

Engine Performance problem
2000 Kia Spectra 4 cyl Automatic

my car was running as usual friday night up till 10 or so. The next morning I went to statr it and it turned over but would not start. We replaced the fuel pump and checked all fuses and spark plugs, (however there is no pressure for the gas either) I did notice for several months befo this when I idled at a stop my exhaust would make a vibration type noise and there was a ping noise but only sometimes while idleing or after the car was off I did just have a tune up 3 weeks prior to the starting issue I also loose sum power when I use the defrost or heater. Any info would be nice very helpful.