In a message dated 8/10/98 9:05:36 PM Eastern Daylight Time, rgolen@UMASSD.EDU
writes:

<< During the past few days my son's 78 bus has been running like
 crap...misfiring, backfiring, etc. at mid to high revs...lack of power.

 So I changed the fuel filter...<<snip>> bought a brand new fuel
 pump...put it in...<<snip>>it idles fine, but as soon as it gets within 750
rpm or so of shifting to the next gear....it dies...I shift up to the next
gear...it catches and runs until its time to shift..then it dies,
etc.<<snip>>leads me to believe the pressure relief valve is to blame.<<snip>>
Opinons? Any ideas?  . >>

Ric--

Sure, the fuel pressure regulator *could* be to blame, but I haven't seen one
go bad (doesn't mean they can't).

Some things to check:

Fuel injector seals--are the little end seals cracked?
Air Filter-- clogged or wet?
Any vacuum leaks anywhere?
Fuel injectors-- has it been a while since you ran some Techron through?
ANY possibility you have crap in your fuel (dirt, rust, sugar, etc?)

best of luck,

gmbulley
cary, nc