1988 Pontiac Firebird hesitate under load

1988 PONTIAC FIREBIRD
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DDMFFOOD
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Engine Performance problem
1988 Pontiac Firebird V8 Two Wheel Drive Automatic

88 firebird has been converted to carb rather than injection. Engine hesitate under load, and diesels when shut down New plugs, wires, coil
Aug 16, 2009 at 12:49 PM
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JACOBANDNICKOLAS
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This is tough one because it isn't OEM. Have you checked for vacuum leaks? What type of fuel pump are you using, the original one? As far as the dieseling, how rich is the engine running, are you using good?
Aug 16, 2009 at 3:46 PM
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DDMFFOOD
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New fuel pump, no vacuum leaks are evident. It's running a little on the rich side, but if I back it off much more it stalls. Could the EGR valve cause this?
Aug 17, 2009 at 8:46 AM
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DDMFFOOD
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Also, it's now bucking pretty good when warm and stalling when warm. Starts right back up after stall.
Aug 17, 2009 at 8:48 AM
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DDMFFOOD
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also, using an Edelbrock 650 four barrell carb is it possible this is not enough carb for a 350 ci motor. fuel adjusters on carb wide open, fuel pressure reg just over 1/2 open. Any more and it floods. any less and it stalls
Aug 17, 2009 at 2:03 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Actually, the fuel pump is my concern. How much pressure is making its way to the carb? Also, yes a bad EGR could cause this too. Remove it and check if it for carbon build up and make sure the valve is sealing shut.
Aug 17, 2009 at 2:17 PM
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