So I went out to start the expy today and it was runing real rough and shaking alot barely wanted to run, so I popped the hood and found a nest made of grass on the passenger side of the intake manifold. Theres a vacuum line that hooks to the intake manifold that got chewed up along with a ground strap on firewall, the wire that hooks to the 4th coil, and the washer hose for the hood. The more I look for chewed up stuff the more I find. Quite a few wires that go to the ecm are chewed up. Whats the easiest way to fix this, just start splicing new wire in or what? The expy has only been sitting since sunday night.

 

If the copper conductor is good and the problem is just the insulation then wrap them with heat shrink tape. After you heat the tape it will be watertight once again.
Use XTreme Tape to Replace Heat-Shrink Wrap

If the copper is damaged, then you have to cut out the bad parts and replace the wires. For these I'd slip on 2 pieces of heat shrink tubing, solder in the new wire, then shrink the tubing over both solder joints to make your repair watertight.

 

Theres a vacuum line that runs behind the battery and runs into the passenger side fender, not sure what its for or where it leads to but its chewed in to a couple different pieces. Any insight would be great.

 

Your best friend in this situation would be a factory shop manual with the wiring diagram so you can see where everything goes and what it does. Other than that, time and solder is all you need, or you could buy replacement harnesses from a junkyard or similar.

 

I got all the vacuum lines sorted out except two plastic ones that run over by egr. One is white and one is red and they both run over to passenger side somewhere.

 

Theres a 3/8" nipple on passenger side of throttle body and I think there are three vacuum lines that run together (black, white, and red) and hook to that nipple. If so thats not how mine was hooked up before the rodent chewed everything up. Can anyone confirm that, it has the 5.4 in it.