artyman1775

I've got a 2002 Chevy Silverado 1500HD 6.0 liter. I replaced the knock sensors and intake valve gaskets when check engine light came on. Now it idles very rough and too high. Check engine light came on again and it reads idle too high and misfire detected. How can I adjust the idle? I've replaced spark plugs and wires already. Wondering if i've got a fuel injector or fuel pressure problem. Cleaning throttle body this weekend but not sure that'll help. It looks ok. Any help would be much appreciated. Thanks

cleveland63b

what codes did you have to start and now? Are you sure you torqued the intake properly and used new gaskets i'm assuming?

artyman1775

Originally I had a bad knock sensor code and replace intake valve gasket code. After completing those repairs it gave me a code for random misfire detected and idle too high. Now it just says random misfire detected. I did torque the intake down properly and I did Use new Intake valve gaskets. Wondering if I've got a bad coil.

cleveland63b

do you have access to a scanner? I'd be looking at the fuel trims and misfire data to narrow down which cylinder(s) to look at