Low control pressure and/or high system pressure????

[Cody Forbes]

> 
> It's hard to say, I was driving at a steady state on I-40 east for
> hours before I had to open the throttle to go up the ramp. I'm going
> to have to say it was gradual though, because I had noticed a small
> bit of rich running while driving arround town before the trip, but I
> tuned it out successfully. In hind-sight this was probably the
> begging of the end for whatever did itself in.     
> 
> I'm going to check the idle switch and update you all.
> 
> -Cody Forbes

Huw said:
  forgive me for "top-postng", but those symptoms sound a bit litke an
  idle switch that is not opening.  Check the two switches on the thorttle
  body... one for "wide open" and one for "idle" - are they both working
  properly?

  A busted idle switch can stop higher revs...

Idle switch tested good, and while I was there I checked the WOT switch. It came back with a bit of resistance when closed, in the area of .300-.400 ohms. I don't think that has much to do wit it though, as the problem happens even at throttle posistions nowhere near what is required to close it.

-Cody Forbes
http://www.5000tq.com
'86 5ktq
'86 5ktq
'86 5k-t-q
'87 5ktq - Fast.