Hey y'all I've got an 02 that's been sitting for roughly 5 months. I went to start it and the battery was dead so I slapped a new one in and now it will start and run for about .8 seconds and shut itself off. If I get on the gas I can keep it running but barely. It won't go over 4k and it sounds like it's missing. I did find a short in the #2 plug wire so I changed the ICM, all of the coil packs, ignition wires and plugs. But none of that helped. I checked the fuel pressure and it's fine so the pump and filter are ok. Also i hook up a code reader to erase codes and I can't get a connection to the engine. And to top all of that off when I keep the accelerator down the exhaust smells like gunpowder. I NEED HELP