3300rpms in first, there is a dead spot that shakes the car violently. Help?

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We have been told to change the fuel filter, we have been used two tanks of GS with Lukas oil and injection cleaner. I am not sure why the fuel filter would work, but we will try it. Can you offer advice on what else to do to troubleshoot this issue? It runs ok cold, once th car is hot it acts up.. Please and thankx