Q: Car shakes in idle and reverse

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My 1966 mustang has driven pretty well for the 2 years I have had it. Recently I changed the oil pan gasket and valve cover gaskets. A few days later I noticed when I would put the car in reverse i could feel something was off. It seemed to be running rough and would shake. I only notice it when in park and reverse. I changed the motor mounts and the harmonic balancer. The issue is still present. When in drive everything feels ok and it shifts through the gears just fine. I also changed the spark plugs as they needed it but that has not resolved the issue. Had a mobile mechanic come look at it and pretty much wasted an HR of time and found nothing and cost me nearly $200. Any ideas?
My car has an automatic transmission.

Hi Cyrel. Thanks for contacting us today. To be honest, there could be multiple issues going on here. It’s more than likely that you have a loose or damaged vacuum line or your ignition timing is off. A damaged torque converter (on an automatic transmission powered vehicle), could cause this type of vibration. I would recommend an onsite inspection, but since it was a waste of your time and money, you might want to consult with a local mechanic or Ford performance expert.

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