Ray Brown
Member
This time of year when I need to use my heat and defroster, my engine starts to shake during acceleration. Also while trying to accelerate to get onto the highway. It feels like the engine is about to fall out. The engine light flashes for approx 30-40 seconds then goes off. I have checked the codes and it says misfire. I changed the coil packs before but this situation only arises with the heat and defrost. It works fine when the air conditioner is on. Could this be something different then coil packs? Please help with this situation.