I've been lurking the forums for some time now while in process of finding/purchasing my Viper. Now that I've had the car a few months, I've run into an issue that I'm hopeful you guys can help with. Sorry for the length, but I'm trying to give as much info as possible. The car is an '03 with intake, headers, corsa track exhaust, and tune. It ran perfectly fine for over a month, and then started to develop a misfire issue. At first, it would run fine for the first 5 minutes, and then start to misfire for a mile or two, and then clean up and run fine for the remainder of any drive. As time has gone on, the issue has become worse to the point that it now is happening pretty much constantly. When it happens, the driver's side bank of cylinders more or less stops firing. You can feel a distinct difference in the exhaust pressure pulses on the driver's side, and it will pop and pulse as it fires/misfires, unlike the smooth/rhythmic output of the passenger side. Similarly, when driving and it happens the driver's side exhaust goes almost completely quiet while the passenger side is still smooth/loud. It'll cut in and out of this state occasionally... run fine for a second or two, then cut out for a few seconds, then back in, etc... which results in the car feeling like you're stabbing the gas on and off. When the car is having this issue, if I let off the gas it'll backfire out the driver's side exhaust and then usually start firing, but once I try to accelerate it'll cut out again. It's an odd sensation to have one ear hearing cylinders firing and the other pretty much complete silence As a little background, I'm an industrial mechanic/electrician by trade and have been restoring Mopar muscle cars my whole life. So I'm mechanically experienced, but dealing with a performance fuel injected car is pretty new. All the plugs are brand new and I've pulled and reseated all the wires multiple times with little effect. The problem also persists regardless of stock/aftermarket tune. Is there a sensor, wire, ground, anything that will impact only the driver's side cylinders? I was thinking a coil going bad, but neither of them are limited purely to the driver's side. I tried running it in the dark and looking for some arc jumping, and didn't see any evidence of that either. Any ideas on what to start chasing? Thanks for any help/ideas you may have.