Motorcraft 2150

[Cduke88]

Hello. I have a AMC 258 i6 / 4.2l with nutter bypass and a motorcraft 2150 carb. Since doing it about 4 yrs ago when I stomp in gas it bogs down and backfires through the carb. Lately it is running super rich. Plugs and wires are new and timing is set at 9 mixture screws are at 1.5 turns. I hook up a vacuum gauge and have plenty of vacuum. When I turn the screws it does nothing on the gauge. As far as I can tell I dont have a leak. I have been messing with this for awhile and am at a loss. It wants to die under a load at low rpms. I was told the jets might be too big but it has only gotten worse recently.

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[Cduke88]

Could it be the power valve?

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[Torxhead]

Sounds like you need some carb work.

 

[Cduke88]

Any ideas?


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[Torxhead]

Bad power valve and check the float level. Keep an eye on the spark plug burn to check richness. After that try smaller jets.