Question about 1988 Pontiac Bonneville

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Runs good at idle but misses on acceleration

I have replaced the fuel pump coil pack module cam sensor.still have no acceleration and code43 EST problem anybody have any idea what this problem is?

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Check your wiring at your ign module, could be moudle or ecm

Posted on Nov 30, 2008

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Consider a ground out (bad wire) to the coil pack? Or low fuel/no fuel pressure caused from a dirty/clogged fuel filter or bad fuel pump? A qualified mechanic can measure the fuel pressure and fuel output. Good luck.

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when you try to accelerate, a couple of things happen. The engine shifts sometimes, and you put it under a load unlike when it is idling.
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