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what would cause a car to break up

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Old Mar 7, 2014 | 03:51 AM
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Default what would cause a car to break up

Car breaks up 1500-3500 rpm,

I changed spark plugs, wires, coils, map sensor.
And it stilll breaks up.

317 heads, vrx5 cam, d1sc, 347, 4l80, 12bolt, aero 340 pump

What could it be?
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Old Mar 7, 2014 | 11:55 AM
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Really lean or rich can make one break up. A cracked plug will make them break up also. Did you drop any plugs or get the socket in a bind?
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Old Mar 7, 2014 | 12:47 PM
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Possibly could be a lean condition. Do you have a wide band on it? Did the problem all the sudden just appear or has it always been like that?

Are you speed density or running a mass air meter.
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Old Mar 8, 2014 | 11:40 AM
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Air fuel goes to about 9.0-9.5.

I drove the car to work fine but on the drive home it felt like no power at all/sluggish.

My buddy hooked up efi live n said the map sensor looked odd pulling more vac the my boost gauge. So i bought a new 2 bar from tick.
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Old Mar 8, 2014 | 11:49 AM
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An speed density
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Old Mar 16, 2014 | 01:04 PM
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i think my areomotive 340 pump killed my stock fpr
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