Trying to sell an 89 truck with a rebuilt 350 in it and it just started running rough. After replacing a few sensors and a couple wet plugs, troubleshooting for a couple hours, we think that one injector could be dumping a lot more fuel than the other.

When you unplug the driver side injector, it keeps running just fine, as if nothing changed. But when you leave that plugged in and unplug the passenger, it dies. It almost runs fine when it is in park or neutral, but when you shift to drive or reverse, it feels like it is misfiring real bad and there is no power when driving.

It just happened all of a sudden and it seems like it has to be something simple.