'88 Subuurban 454

[1988_454]

I'm here trying to figure out what is wrong with my old truck. It bogs down when hot.

[EagleMark]

I think it's the age of the truck? I'm even older then the truck and it happens to me too... it's a bitch getting old... :laugh:

Back to serious, how hot? Any other symptoms? We are quite detailed around here with data loggers so we can see what is happening, hard to figure it out without seeing data.. Just some educated guess's, clogged CAT, bad fuel, clogged fuel filter, weak fuel pump.

Here's a link on how to read codes from the ECM that would help you.
http://www.gearhead-efi.com/Fuel-Injection/showthread.php?52-GM-ECM-Reading-Error-Codes-CEL-SES-Light