I have a Sandrail with a LS1 5.7 Corvette engine that is around a 2005 model and at idle the drivers side has a misfire (pops at idle) but when out running in the sand dunes it seems to run fine. Could it be an injector, coil or the timing through the computer. Any help would be greatly appreciated.

 

Did you check all of your plugs and wires? Im thinking maybe a wire is shorting out on a header primary?

Do you have a way to scan for codes? That should tell you what cylinder is misfiring and will make diagnostics alot easier.

Once you find out what cylinder is missing you need to see if there is spark coming out of the coil. If there is then you check the injector for that cylinder.