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Re: 93 suburban problem
I have an 89 my dad has 95 gmc - both 350s - not 454s, but...
- Check your base timing first - unplug the tan/black (breakout near brake booster or under heater - dunno for sure - check label on rad) (note you will get a code 42 and that's OK- I think you set for 0 degrees - again on label)
- I assume you don't get a lean any other time? Possible problem is fuel pressure is low - check plugged filter and pressure regulator fuel pressure.
- Also check your big vacuum line off the intake to the tranny - might have a break - disconnect.
Let me know if anything helps....
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