Q: Q: Acceleration problems

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I've been having trouble with my Commodore lately. The car starts fine however when I touch foot on the accelrator just in park, the whole car shakes and shudders followed by a only explained as a slight rattling noise. The car will then cut out completely. I've had the RAA look at it and be pretty stumped. Got a lube mobile mechanic to have a look and he tested spark plugs leads etc. all tested ok, for him to then tell me that it's the fuel pump, however the same problem occurs on gas? Could that still be the problem? Any advice?

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