Q: Car jerks after I accelerate past 48mph

asked by on September 25, 2016

When I'm around 48mph, then start to accelerate, my car gives a few jerks, stops around 55mph. Some times around 70mph.

My car has 158640 miles.
My car has an automatic transmission.

Hello, thanks for writing in. I’d be happy to offer my insight. This can be caused by a lack of power from the engine or a transmission issue. I usually check the computer for any codes first to see if there is anything stored in the computer. If there are no codes then I check to see if the spark plugs are in good shape and if the fuel pressure is correct. If there are any issues there, I replace the spark plugs. If they are fine, then I check the transmission fluid. If it is dark or smells burnt then there is a pending transmission issue. There are also a few sensors that can cause this if they are not reading correctly. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose this.

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