Apex shuts down

[dooster]

Got My rear Olin shock back from being rebuilt for the 3rd time and sled put together. Put in brand-new spark plugs and took it for a test drive. Still the same response. Reaches 9200 rpm and completely shuts down and kills the motor to an idle if you let off the throttle right away. If you don't let off the throttle it will kill. And then seems hard to start. Would the coils have anything to do with this? If it is a sensor is there anyway to check them? Still no codes showing up.

 

[kidastra]

check for cracked exhaust pipes

 

[dooster]

I replaced cracked pipe at the same time I had my shock rebuilt. It runs much quieter now but still getting the same response of shutting down as before. Still searching for problem.