Vehicle runs good until around 50mph and while accelerating it begins to spark knock for a second or two, then it stops spark knocking and begins to misfire, run rough, and have low power. If you slow down below 50mph or stop and take off again it will run goo...

Summary posted 1/11/2010

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle