Buck when accelerating
 

Hello everyone, I recently replaced my engine and all has been good with no CEL currently. I’ve been noticing that it bucks sometimes when I let off the gas and get back on it in high rpms. Its strange and I don’t really know cause of this. Now I believe it could just be extra fuel, but i’m not too sure. I’m also switching to a car less midpipe soon if my cat has anything to do with it. Any input would be greatly appreciated!

Engine Power Loss

• chokes as revs increase
  • O2 sensor failure (too rich)
  • MAF failure
  • MAF disconnected
  • e-shaft sensor fouled
  • accessory belt fraying
• high end power loss (hard fuel cut)
  • Rev limit reached
• high end power loss (jerky and stumbling)
  • Ignition failure
  • fuel pressure loss
  • e-shaft sensor fouled
• high end power loss (smooth)
  • Catalytic converter clog
  • air filter clog
• low end power loss (smooth)
  • Engine compression loss
• low end power loss (stumbles)
  • Ignition failure
  • front O2 sensor failure
• revs slowly but smoothly
  • O2 sensor failure (too lean)
  • catalytic converter clog
  • air filter clog
• sudden power drop at a specific rpm
  • Intake valving actuation problem
• trouble getting to redline
  • Ignition failure
  • front O2 sensor failure
  • catalytic converter clog
  • air filter clog
  • e-shaft sensor fouled
  • fuel pressure loss
  • MAF failure