I'm still having problems with this truck. It's a 1993 K2500 with the
5.7 motor. It runs OK when it is cold, but is rough and will die when
it's hot. It's worse idling in gear than out of gear. It's rough, but
doesn't die when I'm driving at speed, but it'll die shortly after I
take my foot off the accelerator. I've replaced the plugs, wires,
rotor, distributor cap, and EGR valve. The rotor had some carbon on
top. I'm not getting any bad codes at all.
Two things that may or may not be important.
1. When I replaced the rotor, I noticed that the top of the
distributor shaft had a thin layer of rust, which I removed. Also, the
shaft has about 3 times more play moving foarward and back than side to
2. The temperature gage hasn't worked since I got the truck two years
ago - it goes up and down when I start the truck, then doesn't move.
The sensor sends signals out (long before I had the current problem,
the truck ran OK with the sensor connected and ran rough with the
sensor disconnected). I get no codes, and the coolant overflow level
rises when the engine is hot, so I assume the cooant system is OK.