No they have been unplugged for well over 2 years. The exhaust is straight pipe no converters and one muffler. Had new coil packs put on in April, with new plugs and plug wires. I've checked most wires around the areas I worked on and no grounding or shorts. All fuses are fine and I have a new mass air flow sensor which I double checked and is properly installed. It seems as tho it's choking when I give it gas, Boggs down, then shuts off, but eventually it will roughly idle. But yesterday I couldn't get it to fire up. Starter works and engine turns over, oils clean. Has 120,000 miles on it.