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When pressing on the brake, the car jumps up a little in the rpm and it does a jerk or two. Hoping it’s not a tranny issue, everything else seems fine with it. Just bought with 52,000 miles on it. Any ideas what could be wrong? Car accelerates fine but when braking it jerks a little and the rpm jumps up and down.
 

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You probably have vacuum loss at the brake booster, false air gets inside the engine when braking. If you don't hear any whooshing sounds, it's probably the check valve at the end of the connected hose.
This way the braking is not fully efficient and engine raises rpm's, really a dangerous combo.
 
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