Sounds like a bind problem... I had this as well, as I hadnt rebinded the rx to the handset quite right. Rebind the rx to the handset and try again. If you have steering working, but the esc still behaves erratically, do a speedo reset.
Follow the instructions, they are actually very clear.
Hope this helps.
Mark
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:: AE B5MCE - SP 7.5 v3.0 Brushless Motor - Reedy Shorty Lipo - Savox Servo - Spektrum Rx ::
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