I have a 94 Chevy 1500 with a 6.5 TD. Sometimes it will run smooth as butter. Other times the ses light will come on and it starts to bog a little bit. Any idea of what this could be? I know I'm being pretty vague but the issue is pretty inconsistant. For instance ill drive to work in the morning about 20 miles with no issues. On the way home all of a sudden the light will pop on, and go off. Than continue to go on and off. Any help would be greatly appreciated.

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I realize I posted this in the wrong forum. My apologies. I'm on my phone so its a bot difficult to navigate