reverse

i think both what its doing is every so often it wont start so one day i took the test light to the wires coming from the handle going into the motor case as soon as it touched the wire i hit the button and it fired right up i shut it back off and took the wire tester off hit the button again and nothing every so often it just thinks its in reverse theres been a few times when ill be in any forward gear and it hits a rev limiter at about 1/4-1/2 throttle just like it would in reverse id take it to get it fixed but it would cost me around $200 because the shops "have to check the problem"