1990 GMC F/S Jimmy 350TBI HEI/700R4 Changed: Rotor, cap, wires, plugs. (all new) Coil: Off of parts suburban.(Believed to be relatively new) Drew a diagram of the plugs and order as I took it apart-so I'm pretty sure the wires are in order. Haven't checked against my manuals though, yet. All connections seem to be secure. I pulled the valve covers off when I was in there just to paint them, so I had to disconnect some "stuff" but I can't find anything I forgot to re-connect. The gasket for the PCV valve was toast, and died when I was taking it out. Right now the tube for the PCV is plugged, but the PCV hole in the valve cover is still open. IIRC an improperly operating PCV valve can cause rough operation. So why is my truck running like poo-poo? First time I took it out the truck just seemed a tag sluggish and the shifts weren't correct. Since I had accidentially moved the rotor a bit when working on it, I played with the timing a bit to get it running better. All I managed to do was get it running worse, and I can't find the wires to my timing light... Any suggestions as to where to look? I don't think it's a firing order issue, it runs too well for that.. but it doesn't sound as good as before the tune up and it doesn't work right of course... Think it could be timing?