Just got a new '93 since a drunk rear ended mine a month ago in front of the house and totalled it. My question is, it idles ok and runs at speed ok but when it drives from a stop, it wants to misfire for about 5 seconds and then it smooths out and runs strong but pings bad under power. The engine is original and appears to be all intact as far as all the factory EFI equipment. No CEL and no idle issues. Timing is correct. I'm wondering if the knock sensor is not working and could cause this or where would you start first?