Hey guys, I am really new here, just bought a DAK yesterday, 1991 5.2L 4wd. Problem is that she wont run right. Starts fine every time, idles smooth, but when I give her throttle above 2K-2300RPMs she stumbles really hard.

To start, I checked for vacuum leaks, plugged them, replaced plugs, wires, cap and rotor, and also installed a new fuel filter.

I am at a loss for what my problem could be. I was thinking maybe timing or fuel pump issue, maybe EGR, but Have no solid Idea on how to approach it. My next step is to check compression.

Any suggestions or advice is greatly appreciated.
Thanks
Derek

 

Ya it could be the EGR which would basically be a vacuum leak, or a low fuel output. Check your fuel pressure and volume.