Discussion Starter · #1 ·
Looking for some guidance on troubleshooting an 2004 ZR5 that has a p0300 code and is misfiring on cylinders 1 and 4 at idle but at 1200 rpm it clears up and is steady. When driving it backfires and bucks on start of motion but with pedal feathering can get up to speed and run fairly smooth. We replaced the spider injector and numerous sensors but still no avail. you can tell by the smell that the truck is running rich but cant tell why. Compression checks were all about the same and during intake smoke check, no major leaks noticed. Any insight would be greatly appreciated.