Hello, I recently acquired a 1993 k2500 4x4 and am having some issues. There is an electrical problem in the park lights line, and the engine is not running so well. The engine will fire up and idle OK, not rough or anything (800-1000 rpm), then when I put it in gear the RPMs drop to ~500 and it will go but hesitate when I give it gas. It feels like it is stumbling over its own wheels. I have replaced;
TPS
IAC
EGR
EGR controller
Vacuum lines
Fuel pressure regulator gaskets and O-rings
Fuel filter
Distro cap and rotor
Spark plugs and wires
O2 sensor.
I believe that is all
Any help will greatly be appreciated. I am by no means a mechanic but can do most of what needs to be done myself.

 

If you have a timing light then I would suggest to advance the timing. The factory setting is 0. advance the timing to 4.

If you don't have access to a timing light then forget it, almost impossible to advance 4 degrees by ear.

 

I have been trying to get a hold of someone that has one but they are all busy right now. (They work on jet boats and it is the busy season). I plan on checking the fuel pressure this weekend and going from there.

 

Maybe this can help also.