93 yukon starting issues

1993 GMC YUKON
5.7L 4wd 2dr
After my 93 yukon has warmed up and I shut it down. When I go to restart it, it will not start. It will turn over and act like it want's to start. I pull the number 1 plug and see if I am getting spark I get a real weak spark and then nothing. If I let the vehicle sit for a little it will fire right up. I have replaced (coil, icm, rotor, cap.) The wires and spark plugs are good. I thought it might be running a little hot, so I replaced water pump, therm, as well as the temp sending unit. When I do the code reader I get 54 and 32. Having a lot of trouble figuring this out. I have been working on this for about 3 week's any help would be appreciated

Code meanings for fuel injected with 4L60E transmission:

Code 32: EGR System--Vacuum switch shorted to ground on start up OR
Switched not closed after the PCM has commanded EGR for a specified period of time OR EGR Solenoid circuit open for a specified period of time.

Code 54: Fuel pump Circuit low voltage---
Sets when fuel pump voltage is less than 2 volts when reference pulses are being recieved.

autozone site:
http://www.autozone.com/az/cds/en_us/0900823d/80/08/70/37/0900823d80087037/repairInfoPages.htm

Clean and check EGR Valve and solenoid.

Check wiring for fuel pump at the top of tank.

Hope this helps

I will try that. Thank you. I have just never heard of those causing the vehicle not to want to start up after it has warmed up. But I will give that a shot. Once again thank you for your help.

does your positive battery cable feels really hot??????? This used to happend to both of my Oldsmobiles. All I had to do if I remember correctly was to replace the positive battery cable.... Hope this helps, all I had was a bad cable......