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FSA1673 · 08-24-2018, 01:43 PM

Your primary jet is too large based on my experience for not using primary rods. I run a 65 jet and have gone to 63s on the primary side with a very similar combo. The pump shot puts a fair amount of fuel when you mat it on the two step and it could cause it to run rich at the start. Are the secondary vent tubs plugged when you remove the air horn? I do not run a two step but someone with experience may be able to help. Have you tried foot braking to see if the AFR is where it should be. The other thing to check is the air door spring tension. If the air door does not open fast enough it will run rich, if it opens too quick it will create a lean bog.

08-24-2018, 01:43 PM	#12
FSA1673 Junior Member Join Date: Jan 2010 Posts: 83 Likes: 0 Liked 12 Times in 6 Posts	Re: quadrajet 455ho Your primary jet is too large based on my experience for not using primary rods. I run a 65 jet and have gone to 63s on the primary side with a very similar combo. The pump shot puts a fair amount of fuel when you mat it on the two step and it could cause it to run rich at the start. Are the secondary vent tubs plugged when you remove the air horn? I do not run a two step but someone with experience may be able to help. Have you tried foot braking to see if the AFR is where it should be. The other thing to check is the air door spring tension. If the air door does not open fast enough it will run rich, if it opens too quick it will create a lean bog.