Yes, I cleaned the throttle body and EGR valve and I checked all the ground wires. Explain a voltage drop test. I may have done it before, but just not familiar with the term. Would this be for my coils or alternator?
I made sure all of my coil packs were seated properly. The next thing I did was to let my engine idle until it started missing again. I disconnected the connectors to the coil packs one by one. Each one on the passenger side made virtually no difference, but the one's on the driver's side almost stalled the engine. It seems as though I'm running on three cylinders sometimes.