Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

1978 Pontiac trans am L78 Qj stumble off idle

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Cliff Ruggles:
No drilling out any hole for APT, just remove the plug and tap the casting for a 3/8"-16 set screw about 3/8" long.

Make sure the power piston hanger arms are level and EXACTLY even.  Adjust the APT to bring in some more fuel and opening up the idle system just a tad will correct the issues you are seeing.

A slight jet/metering rod change may be required as this new fuel requires about 5-7 percent more of it in most cases to make things happy, even with bone stock set-ups......Cliff

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