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I so not mechanical. It would still go just only about 2 mph. LOL. !PIZZA

Describe the symptoms, it is possible that the answer to the problem is on the surface :)

Start not accelerating quickly. then it got to where it would only go about 2mph. Shaking/rattling noise when hitting the gas.

It is possible that there is a sinkhole in the engine block head and antifreeze getting into the oil sump.

I hope my mechanic and figure it out soon.

I hope that he has golden hands, a knowledge-rich mind and a crystal clear conscience :)