89 4.3 tbi automatic. Within a year installed new fuel pump,fuel filter, plugs,wires,button,roter,and distributer. It was driving great and then it wasnt,that simple. Took my kids to school and when i came out it was hesistant to crank, then fired, then wouldnt respond well when applying gas. It would spit and sputter when throttle was hit hard. Cut off twice and fired back up with patting of accelorater. Drove it 10 miles or so like this to work. Tried laying down on it once and it spit black smoke out! Was reving high rpm so i didnt push it after that. Got it to work and now it wont fire at all. It'll roll all day long but never fire off. The injectors are spraying in nice cone shape and i have fire at coil and distributer and at least one plug that i checked! Im stumped on this one, i checked all the fuses and i can hear the relay under hood coming on at ignition. Please help!